51532645 has 4 divisors (see below), whose sum is σ = 61839180. Its totient is φ = 41226112.

The previous prime is 51532643. The next prime is 51532669. The reversal of 51532645 is 54623515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54623515 = 5 ⋅10924703.

It can be written as a sum of positive squares in 2 ways, for example, as 14493249 + 37039396 = 3807^2 + 6086^2 .

It is a cyclic number.

It is not a de Polignac number, because 51532645 - 2¹ = 51532643 is a prime.

It is a super-2 number, since 2×51532645² = 5311227001392050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51532643) 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, 5153260 + ... + 5153269.

It is an arithmetic number, because the mean of its divisors is an integer number (15459795).

Almost surely, 2^51532645 is an apocalyptic number.

It is an amenable number.

51532645 is a deficient number, since it is larger than the sum of its proper divisors (10306535).

51532645 is a wasteful number, since it uses less digits than its factorization.

51532645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306534.

The product of its digits is 18000, while the sum is 31.

The square root of 51532645 is about 7178.6241718034. The cubic root of 51532645 is about 372.1295387497.

The spelling of 51532645 in words is "fifty-one million, five hundred thirty-two thousand, six hundred forty-five".