51516101 has 18 divisors (see below), whose sum is σ = 64901682. Its totient is φ = 40753440.

The previous prime is 51516097. The next prime is 51516167. The reversal of 51516101 is 10161515.

It can be written as a sum of positive squares in 3 ways, for example, as 4264225 + 47251876 = 2065^2 + 6874^2 .

It is not a de Polignac number, because 51516101 - 2² = 51516097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516301) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5171 + ... + 11391.

It is an arithmetic number, because the mean of its divisors is an integer number (3605649).

Almost surely, 2^51516101 is an apocalyptic number.

It is an amenable number.

51516101 is a deficient number, since it is larger than the sum of its proper divisors (13385581).

51516101 is a wasteful number, since it uses less digits than its factorization.

51516101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261 (or 6241 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 51516101 is about 7177.4717693628. The cubic root of 51516101 is about 372.0897117622.

Adding to 51516101 its reverse (10161515), we get a palindrome (61677616).

The spelling of 51516101 in words is "fifty-one million, five hundred sixteen thousand, one hundred one".