64131121 has 2 divisors, whose sum is σ = 64131122. Its totient is φ = 64131120.

The previous prime is 64131097. The next prime is 64131143. The reversal of 64131121 is 12113146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 15689521 = 6960^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 64131121 - 2⁹ = 64130609 is a prime.

It is a super-2 number, since 2×64131121² = 8225601361433282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64161121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32065560 + 32065561.

It is an arithmetic number, because the mean of its divisors is an integer number (32065561).

Almost surely, 2^64131121 is an apocalyptic number.

It is an amenable number.

64131121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64131121 is an equidigital number, since it uses as much as digits as its factorization.

64131121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 64131121 is about 8008.1908693537. The cubic root of 64131121 is about 400.2729824091.

Adding to 64131121 its reverse (12113146), we get a palindrome (76244267).

The spelling of 64131121 in words is "sixty-four million, one hundred thirty-one thousand, one hundred twenty-one".