65631497 has 4 divisors (see below), whose sum is σ = 66268800. Its totient is φ = 64994196.

The previous prime is 65631481. The next prime is 65631499. The reversal of 65631497 is 79413656.

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 65631497 - 2⁴ = 65631481 is a prime.

It is a super-2 number, since 2×65631497² = 8614986796922018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65631499) 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, 318497 + ... + 318702.

It is an arithmetic number, because the mean of its divisors is an integer number (16567200).

Almost surely, 2^65631497 is an apocalyptic number.

It is an amenable number.

65631497 is a deficient number, since it is larger than the sum of its proper divisors (637303).

65631497 is a wasteful number, since it uses less digits than its factorization.

65631497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637302.

The product of its digits is 136080, while the sum is 41.

The square root of 65631497 is about 8101.3268666312. The cubic root of 65631497 is about 403.3704721093.

The spelling of 65631497 in words is "sixty-five million, six hundred thirty-one thousand, four hundred ninety-seven".