64219121 has 2 divisors, whose sum is σ = 64219122. Its totient is φ = 64219120.

The previous prime is 64219039. The next prime is 64219139. The reversal of 64219121 is 12191246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 8880400 = 7439^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 64219121 - 2²² = 60024817 is a prime.

It is not a weakly prime, because it can be changed into another prime (64219171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32109560 + 32109561.

It is an arithmetic number, because the mean of its divisors is an integer number (32109561).

Almost surely, 2^64219121 is an apocalyptic number.

It is an amenable number.

64219121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64219121 is an equidigital number, since it uses as much as digits as its factorization.

64219121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 64219121 is about 8013.6833603531. The cubic root of 64219121 is about 400.4559820867.

The spelling of 64219121 in words is "sixty-four million, two hundred nineteen thousand, one hundred twenty-one".