51091536 has 20 divisors (see below), whose sum is σ = 131986592. Its totient is φ = 17030496.

The previous prime is 51091519. The next prime is 51091543. The reversal of 51091536 is 63519015.

It is a super-2 number, since 2×51091536² = 5220690101678592, 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 3 ways as a sum of consecutive naturals, for example, 532156 + ... + 532251.

Almost surely, 2^51091536 is an apocalyptic number.

It is an amenable number.

51091536 is an abundant number, since it is smaller than the sum of its proper divisors (80895056).

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

51091536 is a wasteful number, since it uses less digits than its factorization.

51091536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064418 (or 1064412 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51091536 is about 7147.8343573421. The cubic root of 51091536 is about 371.0647102223.

The spelling of 51091536 in words is "fifty-one million, ninety-one thousand, five hundred thirty-six".