631977 has 4 divisors (see below), whose sum is σ = 842640. Its totient is φ = 421316.

The previous prime is 631937. The next prime is 631979. The reversal of 631977 is 779136.

631977 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631977 - 2⁶ = 631913 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (631979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105327 + ... + 105332.

It is an arithmetic number, because the mean of its divisors is an integer number (210660).

2⁶³¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

631977 is a deficient number, since it is larger than the sum of its proper divisors (210663).

631977 is a wasteful number, since it uses less digits than its factorization.

631977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210662.

The product of its digits is 7938, while the sum is 33.

The square root of 631977 is about 794.9698107476. The cubic root of 631977 is about 85.8157675012.

The spelling of 631977 in words is "six hundred thirty-one thousand, nine hundred seventy-seven".