51142111 has 4 divisors (see below), whose sum is σ = 51289000. Its totient is φ = 50995224.

The previous prime is 51142097. The next prime is 51142123. The reversal of 51142111 is 11124115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51142111 - 2⁷ = 51141983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51142411) 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, 72921 + ... + 73618.

It is an arithmetic number, because the mean of its divisors is an integer number (12822250).

Almost surely, 2^51142111 is an apocalyptic number.

51142111 is a deficient number, since it is larger than the sum of its proper divisors (146889).

51142111 is a wasteful number, since it uses less digits than its factorization.

51142111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146888.

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

The square root of 51142111 is about 7151.3712671067. The cubic root of 51142111 is about 371.1871075919.

Adding to 51142111 its reverse (11124115), we get a palindrome (62266226).

It can be divided in two parts, 5114 and 2111, that added together give a square (7225 = 85²).

The spelling of 51142111 in words is "fifty-one million, one hundred forty-two thousand, one hundred eleven".