121572631 has 4 divisors (see below), whose sum is σ = 121735264. Its totient is φ = 121410000.

The previous prime is 121572629. The next prime is 121572677. The reversal of 121572631 is 136275121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136275121 = 8011 ⋅17011.

It is a cyclic number.

It is not a de Polignac number, because 121572631 - 2¹ = 121572629 is a prime.

It is a super-2 number, since 2×121572631² = 29559809216524322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121572631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121578631) 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, 80190 + ... + 81691.

It is an arithmetic number, because the mean of its divisors is an integer number (30433816).

Almost surely, 2^121572631 is an apocalyptic number.

121572631 is a deficient number, since it is larger than the sum of its proper divisors (162633).

121572631 is an equidigital number, since it uses as much as digits as its factorization.

121572631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162632.

The product of its digits is 2520, while the sum is 28.

The square root of 121572631 is about 11025.9979593686. The cubic root of 121572631 is about 495.3877599706.

The spelling of 121572631 in words is "one hundred twenty-one million, five hundred seventy-two thousand, six hundred thirty-one".