51521043 has 16 divisors (see below), whose sum is σ = 78611456. Its totient is φ = 29401920.

The previous prime is 51521021. The next prime is 51521077. The reversal of 51521043 is 34012515.

It is not a de Polignac number, because 51521043 - 2⁸ = 51520787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51521443) 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, 24855 + ... + 26847.

It is an arithmetic number, because the mean of its divisors is an integer number (4913216).

Almost surely, 2^51521043 is an apocalyptic number.

51521043 is a deficient number, since it is larger than the sum of its proper divisors (27090413).

51521043 is a wasteful number, since it uses less digits than its factorization.

51521043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51521043 is about 7177.8160327498. The cubic root of 51521043 is about 372.1016097159.

Adding to 51521043 its reverse (34012515), we get a palindrome (85533558).

The spelling of 51521043 in words is "fifty-one million, five hundred twenty-one thousand, forty-three".