51111142 has 16 divisors (see below), whose sum is σ = 77523264. Its totient is φ = 25272000.

The previous prime is 51111139. The next prime is 51111149. The reversal of 51111142 is 24111115.

It is a super-2 number, since 2×51111142² = 5224697673088328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111149) 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, 97842 + ... + 98362.

It is an arithmetic number, because the mean of its divisors is an integer number (4845204).

Almost surely, 2^51111142 is an apocalyptic number.

51111142 is a deficient number, since it is larger than the sum of its proper divisors (26412122).

51111142 is a wasteful number, since it uses less digits than its factorization.

51111142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its digits is 40, while the sum is 16.

The square root of 51111142 is about 7149.2056901449. The cubic root of 51111142 is about 371.1121686006.

Adding to 51111142 its reverse (24111115), we get a palindrome (75222257).

The spelling of 51111142 in words is "fifty-one million, one hundred eleven thousand, one hundred forty-two".