121564997 has 4 divisors (see below), whose sum is σ = 121587936. Its totient is φ = 121542060.

The previous prime is 121564991. The next prime is 121565033. The reversal of 121564997 is 799465121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121564997 - 2²⁶ = 54456133 is a prime.

It is a super-2 number, since 2×121564997² = 29556096991220018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121564991) 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, 998 + ... + 15624.

It is an arithmetic number, because the mean of its divisors is an integer number (30396984).

Almost surely, 2^121564997 is an apocalyptic number.

It is an amenable number.

121564997 is a deficient number, since it is larger than the sum of its proper divisors (22939).

121564997 is an equidigital number, since it uses as much as digits as its factorization.

121564997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22938.

The product of its digits is 136080, while the sum is 44.

The square root of 121564997 is about 11025.6517721176. The cubic root of 121564997 is about 495.3773906704.

The spelling of 121564997 in words is "one hundred twenty-one million, five hundred sixty-four thousand, nine hundred ninety-seven".