51440545 has 32 divisors (see below), whose sum is σ = 69445152. Its totient is φ = 36329472.

The previous prime is 51440539. The next prime is 51440551. The reversal of 51440545 is 54504415.

It is an interprime number because it is at equal distance from previous prime (51440539) and next prime (51440551).

It can be written as a sum of positive squares in 16 ways, for example, as 760384 + 50680161 = 872^2 + 7119^2 .

It is not a de Polignac number, because 51440545 - 2³ = 51440537 is a prime.

It is a super-2 number, since 2×51440545² = 5292259339794050, which contains 22 as substring.

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, 175419 + ... + 175711.

It is an arithmetic number, because the mean of its divisors is an integer number (2170161).

Almost surely, 2^51440545 is an apocalyptic number.

It is an amenable number.

51440545 is a deficient number, since it is larger than the sum of its proper divisors (18004607).

51440545 is a wasteful number, since it uses less digits than its factorization.

51440545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 51440545 is about 7172.2064248040. The cubic root of 51440545 is about 371.9077145148.

The spelling of 51440545 in words is "fifty-one million, four hundred forty thousand, five hundred forty-five".