316121 has 4 divisors (see below), whose sum is σ = 340452. Its totient is φ = 291792.

The previous prime is 316109. The next prime is 316133. The reversal of 316121 is 121613.

316121 = T₂₁₄ + T₂₁₅ + ... + T₂₂₆.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121613 = 31 ⋅3923.

It is an interprime number because it is at equal distance from previous prime (316109) and next prime (316133).

It can be written as a sum of positive squares in 2 ways, for example, as 126025 + 190096 = 355^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 316121 - 2¹⁰ = 315097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 316096 and 316105.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 316121.

It is not an unprimeable number, because it can be changed into a prime (316321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12146 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (85113).

2³¹⁶¹²¹ is an apocalyptic number.

It is an amenable number.

316121 is a deficient number, since it is larger than the sum of its proper divisors (24331).

316121 is a wasteful number, since it uses less digits than its factorization.

316121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24330.

The product of its digits is 36, while the sum is 14.

The square root of 316121 is about 562.2463872716. The cubic root of 316121 is about 68.1215386957.

Adding to 316121 its reverse (121613), we get a palindrome (437734).

It can be divided in two parts, 31612 and 1, that added together give a palindrome (31613).

The spelling of 316121 in words is "three hundred sixteen thousand, one hundred twenty-one".