501253691 has 2 divisors, whose sum is σ = 501253692. Its totient is φ = 501253690.

The previous prime is 501253639. The next prime is 501253703. The reversal of 501253691 is 196352105.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501253691 is a prime.

It is a super-2 number, since 2×501253691² = 502510525482246962, which contains 22 as substring.

It is a Chen prime.

It is equal to p_26418380 and since 501253691 and 26418380 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (501273691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250626845 + 250626846.

It is an arithmetic number, because the mean of its divisors is an integer number (250626846).

Almost surely, 2^501253691 is an apocalyptic number.

501253691 is a deficient number, since it is larger than the sum of its proper divisors (1).

501253691 is an equidigital number, since it uses as much as digits as its factorization.

501253691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 501253691 is about 22388.6956073819. The cubic root of 501253691 is about 794.3633424518.

The spelling of 501253691 in words is "five hundred one million, two hundred fifty-three thousand, six hundred ninety-one".