51549365 has 16 divisors (see below), whose sum is σ = 72202752. Its totient is φ = 34594944.

The previous prime is 51549361. The next prime is 51549397. The reversal of 51549365 is 56394515.

It is a cyclic number.

It is not a de Polignac number, because 51549365 - 2² = 51549361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51549361) 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, 14024 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (4512672).

Almost surely, 2^51549365 is an apocalyptic number.

It is an amenable number.

51549365 is a deficient number, since it is larger than the sum of its proper divisors (20653387).

51549365 is a wasteful number, since it uses less digits than its factorization.

51549365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31396.

The product of its digits is 81000, while the sum is 38.

The square root of 51549365 is about 7179.7886459143. The cubic root of 51549365 is about 372.1697807691.

The spelling of 51549365 in words is "fifty-one million, five hundred forty-nine thousand, three hundred sixty-five".