121313531 has 2 divisors, whose sum is σ = 121313532. Its totient is φ = 121313530.

The previous prime is 121313519. The next prime is 121313557. The reversal of 121313531 is 135313121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121313531 - 2²² = 117119227 is a prime.

It is a super-2 number, since 2×121313531² = 29433945607375922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121315531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656765 + 60656766.

It is an arithmetic number, because the mean of its divisors is an integer number (60656766).

Almost surely, 2^121313531 is an apocalyptic number.

121313531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121313531 is an equidigital number, since it uses as much as digits as its factorization.

121313531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 20.

The square root of 121313531 is about 11014.2421890932. The cubic root of 121313531 is about 495.0355802061.

Adding to 121313531 its reverse (135313121), we get a palindrome (256626652).

The spelling of 121313531 in words is "one hundred twenty-one million, three hundred thirteen thousand, five hundred thirty-one".