121631 has 2 divisors, whose sum is σ = 121632. Its totient is φ = 121630.

The previous prime is 121621. The next prime is 121633. The reversal of 121631 is 136121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121631 - 2¹⁰ = 120607 is a prime.

It is a super-2 number, since 2×121631² = 29588200322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 121633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60815 + 60816.

It is an arithmetic number, because the mean of its divisors is an integer number (60816).

2¹²¹⁶³¹ is an apocalyptic number.

121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

121631 is an equidigital number, since it uses as much as digits as its factorization.

121631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 121631 is about 348.7563619491. The cubic root of 121631 is about 49.5467028530.

Adding to 121631 its reverse (136121), we get a palindrome (257752).

The spelling of 121631 in words is "one hundred twenty-one thousand, six hundred thirty-one".