51400553 has 4 divisors (see below), whose sum is σ = 51881040. Its totient is φ = 50920068.

The previous prime is 51400507. The next prime is 51400577. The reversal of 51400553 is 35500415.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35500415 = 5 ⋅7100083.

It is a cyclic number.

It is not a de Polignac number, because 51400553 - 2¹⁴ = 51384169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51400253) 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, 240083 + ... + 240296.

It is an arithmetic number, because the mean of its divisors is an integer number (12970260).

Almost surely, 2^51400553 is an apocalyptic number.

It is an amenable number.

51400553 is a deficient number, since it is larger than the sum of its proper divisors (480487).

51400553 is a wasteful number, since it uses less digits than its factorization.

51400553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480486.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51400553 is about 7169.4178982676. The cubic root of 51400553 is about 371.8113107321.

Adding to 51400553 its reverse (35500415), we get a palindrome (86900968).

The spelling of 51400553 in words is "fifty-one million, four hundred thousand, five hundred fifty-three".