653947831 has 4 divisors (see below), whose sum is σ = 660422664. Its totient is φ = 647473000.

The previous prime is 653947829. The next prime is 653947849. The reversal of 653947831 is 138749356.

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 653947831 - 2¹ = 653947829 is a prime.

It is a super-2 number, since 2×653947831² = 855295531339209122, 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 (653941831) 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, 3237265 + ... + 3237466.

It is an arithmetic number, because the mean of its divisors is an integer number (165105666).

Almost surely, 2^653947831 is an apocalyptic number.

653947831 is a deficient number, since it is larger than the sum of its proper divisors (6474833).

653947831 is a wasteful number, since it uses less digits than its factorization.

653947831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6474832.

The product of its digits is 544320, while the sum is 46.

The square root of 653947831 is about 25572.4037000826. The cubic root of 653947831 is about 867.9892927495.

The spelling of 653947831 in words is "six hundred fifty-three million, nine hundred forty-seven thousand, eight hundred thirty-one".