51251632 has 20 divisors (see below), whose sum is σ = 99899856. Its totient is φ = 25471040.

The previous prime is 51251611. The next prime is 51251633. The reversal of 51251632 is 23615215.

It is a junction number, because it is equal to n+sod(n) for n = 51251597 and 51251606.

It is not an unprimeable number, because it can be changed into a prime (51251633) 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, 6919 + ... + 12262.

Almost surely, 2^51251632 is an apocalyptic number.

It is an amenable number.

51251632 is a deficient number, since it is larger than the sum of its proper divisors (48648224).

51251632 is a wasteful number, since it uses less digits than its factorization.

51251632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356 (or 19350 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 51251632 is about 7159.0245145550. The cubic root of 51251632 is about 371.4518848145.

Adding to 51251632 its reverse (23615215), we get a palindrome (74866847).

The spelling of 51251632 in words is "fifty-one million, two hundred fifty-one thousand, six hundred thirty-two".