121887631 has 2 divisors, whose sum is σ = 121887632. Its totient is φ = 121887630.

The previous prime is 121887607. The next prime is 121887677. The reversal of 121887631 is 136788121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121887631 is a prime.

It is a super-2 number, since 2×121887631² = 29713189181584322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121887131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60943815 + 60943816.

It is an arithmetic number, because the mean of its divisors is an integer number (60943816).

Almost surely, 2^121887631 is an apocalyptic number.

121887631 is a deficient number, since it is larger than the sum of its proper divisors (1).

121887631 is an equidigital number, since it uses as much as digits as its factorization.

121887631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 121887631 is about 11040.2731397371. The cubic root of 121887631 is about 495.8152480814.

The spelling of 121887631 in words is "one hundred twenty-one million, eight hundred eighty-seven thousand, six hundred thirty-one".