121513 has 4 divisors (see below), whose sum is σ = 138880. Its totient is φ = 104148.

The previous prime is 121507. The next prime is 121523. The reversal of 121513 is 315121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315121 = 181 ⋅1741.

It is a cyclic number.

It is not a de Polignac number, because 121513 - 2⁹ = 121001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121493 and 121502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121523) 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, 8673 + ... + 8686.

It is an arithmetic number, because the mean of its divisors is an integer number (34720).

2¹²¹⁵¹³ is an apocalyptic number.

It is an amenable number.

121513 is a deficient number, since it is larger than the sum of its proper divisors (17367).

121513 is an equidigital number, since it uses as much as digits as its factorization.

121513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17366.

The product of its digits is 30, while the sum is 13.

The square root of 121513 is about 348.5871483575. The cubic root of 121513 is about 49.5306751336.

Adding to 121513 its reverse (315121), we get a palindrome (436634).

The spelling of 121513 in words is "one hundred twenty-one thousand, five hundred thirteen".