51251604 has 24 divisors (see below), whose sum is σ = 119703360. Its totient is φ = 17067264.

The previous prime is 51251597. The next prime is 51251611. The reversal of 51251604 is 40615215.

It is an interprime number because it is at equal distance from previous prime (51251597) and next prime (51251611).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21412 + ... + 23684.

It is an arithmetic number, because the mean of its divisors is an integer number (4987640).

Almost surely, 2^51251604 is an apocalyptic number.

It is an amenable number.

51251604 is an abundant number, since it is smaller than the sum of its proper divisors (68451756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51251604 is a wasteful number, since it uses less digits than its factorization.

51251604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159 (or 4157 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51251604 is about 7159.0225589811. The cubic root of 51251604 is about 371.4518171701.

Adding to 51251604 its reverse (40615215), we get a palindrome (91866819).

The spelling of 51251604 in words is "fifty-one million, two hundred fifty-one thousand, six hundred four".