51117564 has 12 divisors (see below), whose sum is σ = 119274344. Its totient is φ = 17039184.

The previous prime is 51117533. The next prime is 51117571. The reversal of 51117564 is 46571115.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51117564² = 5226010698588192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2129887 + ... + 2129910.

Almost surely, 2^51117564 is an apocalyptic number.

It is an amenable number.

51117564 is an abundant number, since it is smaller than the sum of its proper divisors (68156780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51117564 is a wasteful number, since it uses less digits than its factorization.

51117564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259804 (or 4259802 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 51117564 is about 7149.6548168426. The cubic root of 51117564 is about 371.1277110860.

Adding to 51117564 its reverse (46571115), we get a palindrome (97688679).

It can be divided in two parts, 51117 and 564, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 51117564 in words is "fifty-one million, one hundred seventeen thousand, five hundred sixty-four".