51491694 has 16 divisors (see below), whose sum is σ = 103247568. Its totient is φ = 17119872.

The previous prime is 51491689. The next prime is 51491701. The reversal of 51491694 is 49619415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8427 + ... + 13190.

It is an arithmetic number, because the mean of its divisors is an integer number (6452973).

Almost surely, 2^51491694 is an apocalyptic number.

51491694 is an abundant number, since it is smaller than the sum of its proper divisors (51755874).

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

51491694 is a wasteful number, since it uses less digits than its factorization.

51491694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22019.

The product of its digits is 38880, while the sum is 39.

The square root of 51491694 is about 7175.7713174264. The cubic root of 51491694 is about 372.0309403101.

The spelling of 51491694 in words is "fifty-one million, four hundred ninety-one thousand, six hundred ninety-four".