51151642 has 4 divisors (see below), whose sum is σ = 76727466. Its totient is φ = 25575820.

The previous prime is 51151613. The next prime is 51151687. The reversal of 51151642 is 24615115.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 2556801 = 6971^2 + 1599^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12787909 + ... + 12787912.

Almost surely, 2^51151642 is an apocalyptic number.

51151642 is a deficient number, since it is larger than the sum of its proper divisors (25575824).

51151642 is a wasteful number, since it uses less digits than its factorization.

51151642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25575823.

The product of its digits is 1200, while the sum is 25.

The square root of 51151642 is about 7152.0376117579. The cubic root of 51151642 is about 371.2101646806.

Adding to 51151642 its reverse (24615115), we get a palindrome (75766757).

The spelling of 51151642 in words is "fifty-one million, one hundred fifty-one thousand, six hundred forty-two".