121827631 has 4 divisors (see below), whose sum is σ = 122465664. Its totient is φ = 121189600.

The previous prime is 121827617. The next prime is 121827659. The reversal of 121827631 is 136728121.

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 121827631 - 2⁵ = 121827599 is a prime.

It is a super-2 number, since 2×121827631² = 29683943350144322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121827593 and 121827602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121827131) 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, 318730 + ... + 319111.

It is an arithmetic number, because the mean of its divisors is an integer number (30616416).

Almost surely, 2^121827631 is an apocalyptic number.

121827631 is a deficient number, since it is larger than the sum of its proper divisors (638033).

121827631 is an equidigital number, since it uses as much as digits as its factorization.

121827631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638032.

The product of its digits is 4032, while the sum is 31.

The square root of 121827631 is about 11037.5554811743. Note that the first 3 decimals coincide. The cubic root of 121827631 is about 495.7338786065.

The spelling of 121827631 in words is "one hundred twenty-one million, eight hundred twenty-seven thousand, six hundred thirty-one".