1377889631 has 2 divisors, whose sum is σ = 1377889632. Its totient is φ = 1377889630.

The previous prime is 1377889567. The next prime is 1377889679. The reversal of 1377889631 is 1369887731.

It is a strong prime.

It is an emirp because it is prime and its reverse (1369887731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377889631 - 2⁶ = 1377889567 is a prime.

It is a super-2 number, since 2×1377889631² = 3797159670434632322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377889031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688944815 + 688944816.

It is an arithmetic number, because the mean of its divisors is an integer number (688944816).

Almost surely, 2^1377889631 is an apocalyptic number.

1377889631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377889631 is an equidigital number, since it uses as much as digits as its factorization.

1377889631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 1377889631 is about 37119.9357623367. The cubic root of 1377889631 is about 1112.7684677337.

The spelling of 1377889631 in words is "one billion, three hundred seventy-seven million, eight hundred eighty-nine thousand, six hundred thirty-one".