501641531 has 2 divisors, whose sum is σ = 501641532. Its totient is φ = 501641530.

The previous prime is 501641509. The next prime is 501641551. The reversal of 501641531 is 135146105.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 501641531 - 2²⁶ = 434532667 is a prime.

It is a super-2 number, since 2×501641531² = 503288451248047922, 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 501641531.

It is not a weakly prime, because it can be changed into another prime (501641501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250820765 + 250820766.

It is an arithmetic number, because the mean of its divisors is an integer number (250820766).

Almost surely, 2^501641531 is an apocalyptic number.

501641531 is a deficient number, since it is larger than the sum of its proper divisors (1).

501641531 is an equidigital number, since it uses as much as digits as its factorization.

501641531 is an evil number, because the sum of its binary digits is even.

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

The square root of 501641531 is about 22397.3554465700. The cubic root of 501641531 is about 794.5681665152.

Adding to 501641531 its reverse (135146105), we get a palindrome (636787636).

The spelling of 501641531 in words is "five hundred one million, six hundred forty-one thousand, five hundred thirty-one".