51132561 has 8 divisors (see below), whose sum is σ = 68585664. Its totient is φ = 33883920.

The previous prime is 51132541. The next prime is 51132581. The reversal of 51132561 is 16523115.

It is an interprime number because it is at equal distance from previous prime (51132541) and next prime (51132581).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51132561 - 2⁹ = 51132049 is a prime.

It is a super-2 number, since 2×51132561² = 5229077588837442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51132511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50530 + ... + 51531.

It is an arithmetic number, because the mean of its divisors is an integer number (8573208).

Almost surely, 2^51132561 is an apocalyptic number.

It is an amenable number.

51132561 is a deficient number, since it is larger than the sum of its proper divisors (17453103).

51132561 is a wasteful number, since it uses less digits than its factorization.

51132561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102231.

The product of its digits is 900, while the sum is 24.

The square root of 51132561 is about 7150.7035318212. The cubic root of 51132561 is about 371.1640016655.

Adding to 51132561 its reverse (16523115), we get a palindrome (67655676).

The spelling of 51132561 in words is "fifty-one million, one hundred thirty-two thousand, five hundred sixty-one".