51251506 has 4 divisors (see below), whose sum is σ = 76877262. Its totient is φ = 25625752.

The previous prime is 51251491. The next prime is 51251527. The reversal of 51251506 is 60515215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60515215 = 5 ⋅12103043.

It can be written as a sum of positive squares in only one way, i.e., 51251281 + 225 = 7159^2 + 15^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12812875 + ... + 12812878.

Almost surely, 2^51251506 is an apocalyptic number.

51251506 is a deficient number, since it is larger than the sum of its proper divisors (25625756).

51251506 is a wasteful number, since it uses less digits than its factorization.

51251506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25625755.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51251506 is about 7159.0157144680. The cubic root of 51251506 is about 371.4515804146.

The spelling of 51251506 in words is "fifty-one million, two hundred fifty-one thousand, five hundred six".