51663497 has 4 divisors (see below), whose sum is σ = 53909760. Its totient is φ = 49417236.

The previous prime is 51663463. The next prime is 51663533. The reversal of 51663497 is 79436615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79436615 = 5 ⋅15887323.

It is a cyclic number.

It is not a de Polignac number, because 51663497 - 2²² = 47469193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51663407) 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, 1123097 + ... + 1123142.

It is an arithmetic number, because the mean of its divisors is an integer number (13477440).

Almost surely, 2^51663497 is an apocalyptic number.

It is an amenable number.

51663497 is a deficient number, since it is larger than the sum of its proper divisors (2246263).

51663497 is a wasteful number, since it uses less digits than its factorization.

51663497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246262.

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

The square root of 51663497 is about 7187.7323962429. The cubic root of 51663497 is about 372.4442437155. Note that the first 3 decimals are identical.

The spelling of 51663497 in words is "fifty-one million, six hundred sixty-three thousand, four hundred ninety-seven".