51213142 has 4 divisors (see below), whose sum is σ = 76819716. Its totient is φ = 25606570.

The previous prime is 51213139. The next prime is 51213179. The reversal of 51213142 is 24131215.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12803284 + ... + 12803287.

It is an arithmetic number, because the mean of its divisors is an integer number (19204929).

Almost surely, 2^51213142 is an apocalyptic number.

51213142 is a deficient number, since it is larger than the sum of its proper divisors (25606574).

51213142 is a wasteful number, since it uses less digits than its factorization.

51213142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25606573.

The product of its digits is 240, while the sum is 19.

The square root of 51213142 is about 7156.3357942455. The cubic root of 51213142 is about 371.3588746797.

Adding to 51213142 its reverse (24131215), we get a palindrome (75344357).

The spelling of 51213142 in words is "fifty-one million, two hundred thirteen thousand, one hundred forty-two".