631377 has 18 divisors (see below), whose sum is σ = 955266. Its totient is φ = 401760.

The previous prime is 631361. The next prime is 631387. The reversal of 631377 is 773136.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 77841 = 744^2 + 279^2 .

It is not a de Polignac number, because 631377 - 2⁴ = 631361 is a prime.

It is a super-2 number, since 2×631377² = 797273832258, which contains 22 as substring.

631377 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 631377.

It is not an unprimeable number, because it can be changed into a prime (631307) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8613 + ... + 8685.

2⁶³¹³⁷⁷ is an apocalyptic number.

It is an amenable number.

631377 is a deficient number, since it is larger than the sum of its proper divisors (323889).

631377 is a wasteful number, since it uses less digits than its factorization.

631377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 107 counting only the distinct ones).

The product of its digits is 2646, while the sum is 27.

The square root of 631377 is about 794.5923483145. The cubic root of 631377 is about 85.7886010253.

The spelling of 631377 in words is "six hundred thirty-one thousand, three hundred seventy-seven".