51515371 has 2 divisors, whose sum is σ = 51515372. Its totient is φ = 51515370.

The previous prime is 51515369. The next prime is 51515407. The reversal of 51515371 is 17351515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51515371 - 2¹ = 51515369 is a prime.

Together with 51515369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51515351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757685 + 25757686.

It is an arithmetic number, because the mean of its divisors is an integer number (25757686).

Almost surely, 2^51515371 is an apocalyptic number.

51515371 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515371 is an equidigital number, since it uses as much as digits as its factorization.

51515371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2625, while the sum is 28.

The square root of 51515371 is about 7177.4209156214. The cubic root of 51515371 is about 372.0879542096.

Adding to 51515371 its reverse (17351515), we get a palindrome (68866886).

The spelling of 51515371 in words is "fifty-one million, five hundred fifteen thousand, three hundred seventy-one".