31413121 has 4 divisors (see below), whose sum is σ = 31724244. Its totient is φ = 31102000.

The previous prime is 31413103. The next prime is 31413131. The reversal of 31413121 is 12131413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24364096 + 7049025 = 4936^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 31413121 - 2⁵ = 31413089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31413095 and 31413104.

It is not an unprimeable number, because it can be changed into a prime (31413131) 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, 155410 + ... + 155611.

It is an arithmetic number, because the mean of its divisors is an integer number (7931061).

Almost surely, 2^31413121 is an apocalyptic number.

It is an amenable number.

31413121 is a deficient number, since it is larger than the sum of its proper divisors (311123).

31413121 is a wasteful number, since it uses less digits than its factorization.

31413121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311122.

The product of its digits is 72, while the sum is 16.

The square root of 31413121 is about 5604.7409395975. The cubic root of 31413121 is about 315.5273638595.

Adding to 31413121 its reverse (12131413), we get a palindrome (43544534).

The spelling of 31413121 in words is "thirty-one million, four hundred thirteen thousand, one hundred twenty-one".