51701581 has 2 divisors, whose sum is σ = 51701582. Its totient is φ = 51701580.

The previous prime is 51701567. The next prime is 51701621. The reversal of 51701581 is 18510715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51408900 + 292681 = 7170^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 51701581 - 2⁵ = 51701549 is a prime.

It is a super-2 number, since 2×51701581² = 5346106955799122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51701501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25850790 + 25850791.

It is an arithmetic number, because the mean of its divisors is an integer number (25850791).

Almost surely, 2^51701581 is an apocalyptic number.

It is an amenable number.

51701581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51701581 is an equidigital number, since it uses as much as digits as its factorization.

51701581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 51701581 is about 7190.3811442788. The cubic root of 51701581 is about 372.5357376039.

The spelling of 51701581 in words is "fifty-one million, seven hundred one thousand, five hundred eighty-one".