51215352 has 16 divisors (see below), whose sum is σ = 128038440. Its totient is φ = 17071776.

The previous prime is 51215347. The next prime is 51215357. The reversal of 51215352 is 25351215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51215347) and next prime (51215357).

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2133973 = 51215352 / (5 + 1 + 2 + 1 + 5 + 3 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215357) 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, 1066963 + ... + 1067010.

Almost surely, 2^51215352 is an apocalyptic number.

It is an amenable number.

51215352 is an abundant number, since it is smaller than the sum of its proper divisors (76823088).

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

51215352 is a wasteful number, since it uses less digits than its factorization.

51215352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133982 (or 2133978 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 51215352 is about 7156.4902012090. The cubic root of 51215352 is about 371.3642163510.

Adding to 51215352 its reverse (25351215), we get a palindrome (76566567).

The spelling of 51215352 in words is "fifty-one million, two hundred fifteen thousand, three hundred fifty-two".