1377905831 has 2 divisors, whose sum is σ = 1377905832. Its totient is φ = 1377905830.

The previous prime is 1377905801. The next prime is 1377905833. The reversal of 1377905831 is 1385097731.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377905831 is a prime.

It is a super-2 number, since 2×1377905831² = 3797248958207601122, which contains 22 as substring.

Together with 1377905833, 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 (1377905833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688952915 + 688952916.

It is an arithmetic number, because the mean of its divisors is an integer number (688952916).

Almost surely, 2^1377905831 is an apocalyptic number.

1377905831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377905831 is an equidigital number, since it uses as much as digits as its factorization.

1377905831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 1377905831 is about 37120.1539732798. The cubic root of 1377905831 is about 1112.7728286970.

The spelling of 1377905831 in words is "one billion, three hundred seventy-seven million, nine hundred five thousand, eight hundred thirty-one".