51122145 has 32 divisors (see below), whose sum is σ = 86994432. Its totient is φ = 25546752.

The previous prime is 51122129. The next prime is 51122153. The reversal of 51122145 is 54122115.

It is not a de Polignac number, because 51122145 - 2⁴ = 51122129 is a prime.

It is a super-2 number, since 2×51122145² = 5226947418802050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110184 + ... + 110646.

It is an arithmetic number, because the mean of its divisors is an integer number (2718576).

Almost surely, 2^51122145 is an apocalyptic number.

It is an amenable number.

51122145 is a deficient number, since it is larger than the sum of its proper divisors (35872287).

51122145 is a wasteful number, since it uses less digits than its factorization.

51122145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921.

The product of its digits is 400, while the sum is 21.

The square root of 51122145 is about 7149.9751747821. The cubic root of 51122145 is about 371.1387971989.

The spelling of 51122145 in words is "fifty-one million, one hundred twenty-two thousand, one hundred forty-five".