51709492 has 6 divisors (see below), whose sum is σ = 90491618. Its totient is φ = 25854744.

The previous prime is 51709481. The next prime is 51709501. The reversal of 51709492 is 29490715.

It can be written as a sum of positive squares in only one way, i.e., 36917776 + 14791716 = 6076^2 + 3846^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6463683 + ... + 6463690.

Almost surely, 2^51709492 is an apocalyptic number.

It is an amenable number.

51709492 is a deficient number, since it is larger than the sum of its proper divisors (38782126).

51709492 is a wasteful number, since it uses less digits than its factorization.

51709492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12927377 (or 12927375 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 51709492 is about 7190.9312331575. The cubic root of 51709492 is about 372.5547375382.

The spelling of 51709492 in words is "fifty-one million, seven hundred nine thousand, four hundred ninety-two".