51491164 has 24 divisors (see below), whose sum is σ = 96299280. Its totient is φ = 24005376.

The previous prime is 51491149. The next prime is 51491183. The reversal of 51491164 is 46119415.

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, 3939 + ... + 10885.

It is an arithmetic number, because the mean of its divisors is an integer number (4012470).

Almost surely, 2^51491164 is an apocalyptic number.

It is an amenable number.

51491164 is a deficient number, since it is larger than the sum of its proper divisors (44808116).

51491164 is a wasteful number, since it uses less digits than its factorization.

51491164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077 (or 7075 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 51491164 is about 7175.7343875035. The cubic root of 51491164 is about 372.0296638772.

The spelling of 51491164 in words is "fifty-one million, four hundred ninety-one thousand, one hundred sixty-four".