653406631 has 4 divisors (see below), whose sum is σ = 665735112. Its totient is φ = 641078152.

The previous prime is 653406587. The next prime is 653406653. The reversal of 653406631 is 136604356.

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 653406631 - 2⁹ = 653406119 is a prime.

It is a super-2 number, since 2×653406631² = 853880450869540322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653406661) 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, 6164161 + ... + 6164266.

It is an arithmetic number, because the mean of its divisors is an integer number (166433778).

Almost surely, 2^653406631 is an apocalyptic number.

653406631 is a deficient number, since it is larger than the sum of its proper divisors (12328481).

653406631 is a wasteful number, since it uses less digits than its factorization.

653406631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12328480.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 653406631 is about 25561.8197904609. The cubic root of 653406631 is about 867.7497805485.

The spelling of 653406631 in words is "six hundred fifty-three million, four hundred six thousand, six hundred thirty-one".