64180531 has 2 divisors, whose sum is σ = 64180532. Its totient is φ = 64180530.

The previous prime is 64180517. The next prime is 64180541. The reversal of 64180531 is 13508146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64180531 - 2²¹ = 62083379 is a prime.

It is a super-2 number, since 2×64180531² = 8238281118883922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64180531.

It is not a weakly prime, because it can be changed into another prime (64180541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32090265 + 32090266.

It is an arithmetic number, because the mean of its divisors is an integer number (32090266).

Almost surely, 2^64180531 is an apocalyptic number.

64180531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64180531 is an equidigital number, since it uses as much as digits as its factorization.

64180531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 64180531 is about 8011.2752418076. The cubic root of 64180531 is about 400.3757531634.

Adding to 64180531 its reverse (13508146), we get a palindrome (77688677).

The spelling of 64180531 in words is "sixty-four million, one hundred eighty thousand, five hundred thirty-one".