921957131 has 2 divisors, whose sum is σ = 921957132. Its totient is φ = 921957130.

The previous prime is 921957061. The next prime is 921957133. The reversal of 921957131 is 131759129.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921957131 is a prime.

It is a super-2 number, since 2×921957131² = 1700009902803502322, which contains 22 as substring.

Together with 921957133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (921957133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460978565 + 460978566.

It is an arithmetic number, because the mean of its divisors is an integer number (460978566).

Almost surely, 2^921957131 is an apocalyptic number.

921957131 is a deficient number, since it is larger than the sum of its proper divisors (1).

921957131 is an equidigital number, since it uses as much as digits as its factorization.

921957131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 38.

The square root of 921957131 is about 30363.7469855089. The cubic root of 921957131 is about 973.2780057712.

The spelling of 921957131 in words is "nine hundred twenty-one million, nine hundred fifty-seven thousand, one hundred thirty-one".