1977922231 has 2 divisors, whose sum is σ = 1977922232. Its totient is φ = 1977922230.

The previous prime is 1977922223. The next prime is 1977922259. The reversal of 1977922231 is 1322297791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1977922231 - 2³ = 1977922223 is a prime.

It is a super-2 number, since 2×1977922231² = 7824352703768034722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977922201) 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, 988961115 + 988961116.

It is an arithmetic number, because the mean of its divisors is an integer number (988961116).

Almost surely, 2^1977922231 is an apocalyptic number.

1977922231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977922231 is an equidigital number, since it uses as much as digits as its factorization.

1977922231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 1977922231 is about 44473.8376014483. The cubic root of 1977922231 is about 1255.2678446113.

The spelling of 1977922231 in words is "one billion, nine hundred seventy-seven million, nine hundred twenty-two thousand, two hundred thirty-one".