121636531 has 4 divisors (see below), whose sum is σ = 121697064. Its totient is φ = 121576000.

The previous prime is 121636523. The next prime is 121636549. The reversal of 121636531 is 135636121.

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

It is a cyclic number.

It is not a de Polignac number, because 121636531 - 2³ = 121636523 is a prime.

It is a super-2 number, since 2×121636531² = 29590891347427922, 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 121636531.

It is not an unprimeable number, because it can be changed into a prime (121636231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27145 + ... + 31306.

It is an arithmetic number, because the mean of its divisors is an integer number (30424266).

Almost surely, 2^121636531 is an apocalyptic number.

121636531 is a deficient number, since it is larger than the sum of its proper divisors (60533).

121636531 is an equidigital number, since it uses as much as digits as its factorization.

121636531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60532.

The product of its digits is 3240, while the sum is 28.

The square root of 121636531 is about 11028.8952755931. The cubic root of 121636531 is about 495.4745386397.

The spelling of 121636531 in words is "one hundred twenty-one million, six hundred thirty-six thousand, five hundred thirty-one".