51691548 has 12 divisors (see below), whose sum is σ = 120613640. Its totient is φ = 17230512.

The previous prime is 51691537. The next prime is 51691559. The reversal of 51691548 is 84519615.

It is an interprime number because it is at equal distance from previous prime (51691537) and next prime (51691559).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51691548² = 5344032269272608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153803 + ... + 2153826.

Almost surely, 2^51691548 is an apocalyptic number.

It is an amenable number.

51691548 is an abundant number, since it is smaller than the sum of its proper divisors (68922092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51691548 is a wasteful number, since it uses less digits than its factorization.

51691548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307636 (or 4307634 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 51691548 is about 7189.6834422664. The cubic root of 51691548 is about 372.5116384514.

The spelling of 51691548 in words is "fifty-one million, six hundred ninety-one thousand, five hundred forty-eight".