64261331 has 2 divisors, whose sum is σ = 64261332. Its totient is φ = 64261330.

The previous prime is 64261291. The next prime is 64261367. The reversal of 64261331 is 13316246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64261331 is a prime.

It is a super-2 number, since 2×64261331² = 8259037323783122, 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 64261331.

It is not a weakly prime, because it can be changed into another prime (64261031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32130665 + 32130666.

It is an arithmetic number, because the mean of its divisors is an integer number (32130666).

Almost surely, 2^64261331 is an apocalyptic number.

64261331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64261331 is an equidigital number, since it uses as much as digits as its factorization.

64261331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 64261331 is about 8016.3165481410. The cubic root of 64261331 is about 400.5437002237.

Adding to 64261331 its reverse (13316246), we get a palindrome (77577577).

The spelling of 64261331 in words is "sixty-four million, two hundred sixty-one thousand, three hundred thirty-one".