51111747 has 12 divisors (see below), whose sum is σ = 74283144. Its totient is φ = 33864480.

The previous prime is 51111743. The next prime is 51111761. The reversal of 51111747 is 74711115.

It is not a de Polignac number, because 51111747 - 2² = 51111743 is a prime.

It is a super-2 number, since 2×51111747² = 5224821362784018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51111747.

It is not an unprimeable number, because it can be changed into a prime (51111743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15954 + ... + 18887.

It is an arithmetic number, because the mean of its divisors is an integer number (6190262).

Almost surely, 2^51111747 is an apocalyptic number.

51111747 is a deficient number, since it is larger than the sum of its proper divisors (23171397).

51111747 is a wasteful number, since it uses less digits than its factorization.

51111747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35010 (or 35007 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 51111747 is about 7149.2480024126. The cubic root of 51111747 is about 371.1136328734.

The spelling of 51111747 in words is "fifty-one million, one hundred eleven thousand, seven hundred forty-seven".