51356625 has 16 divisors (see below), whose sum is σ = 85458048. Its totient is φ = 27390000.

The previous prime is 51356623. The next prime is 51356633. The reversal of 51356625 is 52665315.

It is not a de Polignac number, because 51356625 - 2¹ = 51356623 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51356621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68101 + ... + 68850.

It is an arithmetic number, because the mean of its divisors is an integer number (5341128).

Almost surely, 2^51356625 is an apocalyptic number.

It is an amenable number.

51356625 is a deficient number, since it is larger than the sum of its proper divisors (34101423).

51356625 is a wasteful number, since it uses less digits than its factorization.

51356625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136969 (or 136959 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The square root of 51356625 is about 7166.3536753359. The cubic root of 51356625 is about 371.7053612735.

It can be divided in two parts, 513566 and 25, that added together give a triangular number (513591 = T₁₀₁₃).

The spelling of 51356625 in words is "fifty-one million, three hundred fifty-six thousand, six hundred twenty-five".