51641531 has 2 divisors, whose sum is σ = 51641532. Its totient is φ = 51641530.

The previous prime is 51641507. The next prime is 51641537. The reversal of 51641531 is 13514615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51641531 - 2¹⁰ = 51640507 is a prime.

It is a super-2 number, since 2×51641531² = 5333695448047922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51641531.

It is not a weakly prime, because it can be changed into another prime (51641537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25820765 + 25820766.

It is an arithmetic number, because the mean of its divisors is an integer number (25820766).

Almost surely, 2^51641531 is an apocalyptic number.

51641531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51641531 is an equidigital number, since it uses as much as digits as its factorization.

51641531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 51641531 is about 7186.2042136304. The cubic root of 51641531 is about 372.3914516381.

The spelling of 51641531 in words is "fifty-one million, six hundred forty-one thousand, five hundred thirty-one".