51489492 has 24 divisors (see below), whose sum is σ = 121010400. Its totient is φ = 17039136.

The previous prime is 51489491. The next prime is 51489509. The reversal of 51489492 is 29498415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51489491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13767 + ... + 17102.

It is an arithmetic number, because the mean of its divisors is an integer number (5042100).

Almost surely, 2^51489492 is an apocalyptic number.

It is an amenable number.

51489492 is an abundant number, since it is smaller than the sum of its proper divisors (69520908).

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

51489492 is a wasteful number, since it uses less digits than its factorization.

51489492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31015 (or 31013 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 51489492 is about 7175.6178828028. The cubic root of 51489492 is about 372.0256370353.

The spelling of 51489492 in words is "fifty-one million, four hundred eighty-nine thousand, four hundred ninety-two".