51115388 has 12 divisors (see below), whose sum is σ = 89519640. Its totient is φ = 25538352.

The previous prime is 51115381. The next prime is 51115399. The reversal of 51115388 is 88351115.

It is a happy number.

It is a super-2 number, since 2×51115388² = 5225565780781088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115381) 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, 2270 + ... + 10362.

It is an arithmetic number, because the mean of its divisors is an integer number (7459970).

Almost surely, 2^51115388 is an apocalyptic number.

It is an amenable number.

51115388 is a deficient number, since it is larger than the sum of its proper divisors (38404252).

51115388 is a wasteful number, since it uses less digits than its factorization.

51115388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9676 (or 9674 counting only the distinct ones).

The product of its digits is 4800, while the sum is 32.

The square root of 51115388 is about 7149.5026400443. The cubic root of 51115388 is about 371.1224448898.

The spelling of 51115388 in words is "fifty-one million, one hundred fifteen thousand, three hundred eighty-eight".