51501139 has 2 divisors, whose sum is σ = 51501140. Its totient is φ = 51501138.

The previous prime is 51501103. The next prime is 51501157. The reversal of 51501139 is 93110515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51501139 - 2¹⁹ = 50976851 is a prime.

It is not a weakly prime, because it can be changed into another prime (51501169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750569 + 25750570.

It is an arithmetic number, because the mean of its divisors is an integer number (25750570).

Almost surely, 2^51501139 is an apocalyptic number.

51501139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51501139 is an equidigital number, since it uses as much as digits as its factorization.

51501139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 51501139 is about 7176.4294046552. The cubic root of 51501139 is about 372.0536858388.

The spelling of 51501139 in words is "fifty-one million, five hundred one thousand, one hundred thirty-nine".