632981 has 4 divisors (see below), whose sum is σ = 635052. Its totient is φ = 630912.

The previous prime is 632977. The next prime is 632987. The reversal of 632981 is 189236.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504100 + 128881 = 710^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 632981 - 2² = 632977 is a prime.

It is a super-2 number, since 2×632981² = 801329892722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (632987) 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, 476 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (158763).

2⁶³²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

632981 is a deficient number, since it is larger than the sum of its proper divisors (2071).

632981 is a wasteful number, since it uses less digits than its factorization.

632981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its digits is 2592, while the sum is 29.

The square root of 632981 is about 795.6010306680. The cubic root of 632981 is about 85.8611876377.

The spelling of 632981 in words is "six hundred thirty-two thousand, nine hundred eighty-one".