51091725 has 24 divisors (see below), whose sum is σ = 85029280. Its totient is φ = 27069120.

The previous prime is 51091693. The next prime is 51091727. The reversal of 51091725 is 52719015.

It is not a de Polignac number, because 51091725 - 2⁵ = 51091693 is a prime.

It is a super-2 number, since 2×51091725² = 5220728726951250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51091692 and 51091701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9606 + ... + 13944.

Almost surely, 2^51091725 is an apocalyptic number.

It is an amenable number.

51091725 is a deficient number, since it is larger than the sum of its proper divisors (33937555).

51091725 is a wasteful number, since it uses less digits than its factorization.

51091725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509 (or 4504 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 51091725 is about 7147.8475781175. The cubic root of 51091725 is about 371.0651677746.

It can be divided in two parts, 510 and 91725, that added together give a triangular number (92235 = T₄₂₉).

The spelling of 51091725 in words is "fifty-one million, ninety-one thousand, seven hundred twenty-five".