63979121 has 2 divisors, whose sum is σ = 63979122. Its totient is φ = 63979120.

The previous prime is 63979117. The next prime is 63979127. The reversal of 63979121 is 12197936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 15523600 = 6961^2 + 3940^2 .

It is a cyclic number.

It is not a de Polignac number, because 63979121 - 2² = 63979117 is a prime.

It is equal to p_3783926 and since 63979121 and 3783926 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (63979127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31989560 + 31989561.

It is an arithmetic number, because the mean of its divisors is an integer number (31989561).

Almost surely, 2^63979121 is an apocalyptic number.

It is an amenable number.

63979121 is a deficient number, since it is larger than the sum of its proper divisors (1).

63979121 is an equidigital number, since it uses as much as digits as its factorization.

63979121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 63979121 is about 7998.6949560538. The cubic root of 63979121 is about 399.9564973523.

The spelling of 63979121 in words is "sixty-three million, nine hundred seventy-nine thousand, one hundred twenty-one".