51549369 has 4 divisors (see below), whose sum is σ = 68732496. Its totient is φ = 34366244.

The previous prime is 51549361. The next prime is 51549397. The reversal of 51549369 is 96394515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51549369 - 2³ = 51549361 is a prime.

It is a super-2 number, since 2×51549369² = 5314674888596322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51549369.

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 3 ways as a sum of consecutive naturals, for example, 8591559 + ... + 8591564.

It is an arithmetic number, because the mean of its divisors is an integer number (17183124).

Almost surely, 2^51549369 is an apocalyptic number.

It is an amenable number.

51549369 is a deficient number, since it is larger than the sum of its proper divisors (17183127).

51549369 is a wasteful number, since it uses less digits than its factorization.

51549369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17183126.

The product of its digits is 145800, while the sum is 42.

The square root of 51549369 is about 7179.7889244740. The cubic root of 51549369 is about 372.1697903953.

The spelling of 51549369 in words is "fifty-one million, five hundred forty-nine thousand, three hundred sixty-nine".