121668531 has 4 divisors (see below), whose sum is σ = 162224712. Its totient is φ = 81112352.

The previous prime is 121668509. The next prime is 121668553. The reversal of 121668531 is 135866121.

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

It is an interprime number because it is at equal distance from previous prime (121668509) and next prime (121668553).

It is a cyclic number.

It is not a de Polignac number, because 121668531 - 2⁷ = 121668403 is a prime.

It is a super-2 number, since 2×121668531² = 29606462871395922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121668492 and 121668501.

It is not an unprimeable number, because it can be changed into a prime (121668581) 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, 20278086 + ... + 20278091.

It is an arithmetic number, because the mean of its divisors is an integer number (40556178).

Almost surely, 2^121668531 is an apocalyptic number.

121668531 is a deficient number, since it is larger than the sum of its proper divisors (40556181).

121668531 is an equidigital number, since it uses as much as digits as its factorization.

121668531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40556180.

The product of its digits is 8640, while the sum is 33.

The square root of 121668531 is about 11030.3459147934. The cubic root of 121668531 is about 495.5179844557.

The spelling of 121668531 in words is "one hundred twenty-one million, six hundred sixty-eight thousand, five hundred thirty-one".