65403631 has 4 divisors (see below), whose sum is σ = 65461032. Its totient is φ = 65346232.

The previous prime is 65403623. The next prime is 65403659. The reversal of 65403631 is 13630456.

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

It is a cyclic number.

It is not a de Polignac number, because 65403631 - 2³ = 65403623 is a prime.

It is a super-2 number, since 2×65403631² = 8555269895968322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65403631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65406631) 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, 26956 + ... + 29281.

It is an arithmetic number, because the mean of its divisors is an integer number (16365258).

Almost surely, 2^65403631 is an apocalyptic number.

65403631 is a deficient number, since it is larger than the sum of its proper divisors (57401).

65403631 is a wasteful number, since it uses less digits than its factorization.

65403631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57400.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 65403631 is about 8087.2511399115. The cubic root of 65403631 is about 402.9031101545.

The spelling of 65403631 in words is "sixty-five million, four hundred three thousand, six hundred thirty-one".