51150561 has 32 divisors (see below), whose sum is σ = 86784000. Its totient is φ = 26565840.

The previous prime is 51150557. The next prime is 51150571. The reversal of 51150561 is 16505115.

It is not a de Polignac number, because 51150561 - 2² = 51150557 is a prime.

It is a super-2 number, since 2×51150561² = 5232759781229442, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51150511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9060 + ... + 13578.

It is an arithmetic number, because the mean of its divisors is an integer number (2712000).

Almost surely, 2^51150561 is an apocalyptic number.

It is an amenable number.

51150561 is a deficient number, since it is larger than the sum of its proper divisors (35633439).

51150561 is a wasteful number, since it uses less digits than its factorization.

51150561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554 (or 4540 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51150561 is about 7151.9620384899. The cubic root of 51150561 is about 371.2075497042.

Adding to 51150561 its reverse (16505115), we get a palindrome (67655676).

It can be divided in two parts, 511505 and 61, that added together give a triangular number (511566 = T₁₀₁₁).

The spelling of 51150561 in words is "fifty-one million, one hundred fifty thousand, five hundred sixty-one".