51581742 has 16 divisors (see below), whose sum is σ = 103735632. Its totient is φ = 17098560.

The previous prime is 51581729. The next prime is 51581767. The reversal of 51581742 is 24718515.

It is a super-2 number, since 2×51581742² = 5321352215509128, 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 7 ways as a sum of consecutive naturals, for example, 22663 + ... + 24834.

It is an arithmetic number, because the mean of its divisors is an integer number (6483477).

Almost surely, 2^51581742 is an apocalyptic number.

51581742 is an abundant number, since it is smaller than the sum of its proper divisors (52153890).

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

51581742 is a wasteful number, since it uses less digits than its factorization.

51581742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47683.

The product of its digits is 11200, while the sum is 33.

The square root of 51581742 is about 7182.0430240984. The cubic root of 51581742 is about 372.2476816262.

The spelling of 51581742 in words is "fifty-one million, five hundred eighty-one thousand, seven hundred forty-two".