1977839131 has 2 divisors, whose sum is σ = 1977839132. Its totient is φ = 1977839130.

The previous prime is 1977839089. The next prime is 1977839147. The reversal of 1977839131 is 1319387791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1977839131 - 2¹⁷ = 1977708059 is a prime.

It is a super-2 number, since 2×1977839131² = 7823695256229670322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1977879131) 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, 988919565 + 988919566.

It is an arithmetic number, because the mean of its divisors is an integer number (988919566).

Almost surely, 2^1977839131 is an apocalyptic number.

1977839131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977839131 is an equidigital number, since it uses as much as digits as its factorization.

1977839131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 49.

The square root of 1977839131 is about 44472.9033345025. The cubic root of 1977839131 is about 1255.2502648472.

The spelling of 1977839131 in words is "one billion, nine hundred seventy-seven million, eight hundred thirty-nine thousand, one hundred thirty-one".