51025513 has 24 divisors (see below), whose sum is σ = 65319264. Its totient is φ = 39412800.

The previous prime is 51025511. The next prime is 51025531. The reversal of 51025513 is 31552015.

It is not a de Polignac number, because 51025513 - 2¹ = 51025511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51025511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73498 + ... + 74188.

It is an arithmetic number, because the mean of its divisors is an integer number (2721636).

Almost surely, 2^51025513 is an apocalyptic number.

It is an amenable number.

51025513 is a deficient number, since it is larger than the sum of its proper divisors (14293751).

51025513 is a wasteful number, since it uses less digits than its factorization.

51025513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51025513 is about 7143.2144724907. The cubic root of 51025513 is about 370.9048052901.

Adding to 51025513 its reverse (31552015), we get a palindrome (82577528).

The spelling of 51025513 in words is "fifty-one million, twenty-five thousand, five hundred thirteen".