431556655121 has 2 divisors, whose sum is σ = 431556655122. Its totient is φ = 431556655120.

The previous prime is 431556655099. The next prime is 431556655141. The reversal of 431556655121 is 121556655134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386000021521 + 45556633600 = 621289^2 + 213440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431556655121 is a prime.

It is a super-2 number, since 2×431556655121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (431556655141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215778327560 + 215778327561.

It is an arithmetic number, because the mean of its divisors is an integer number (215778327561).

Almost surely, 2^431556655121 is an apocalyptic number.

It is an amenable number.

431556655121 is a deficient number, since it is larger than the sum of its proper divisors (1).

431556655121 is an equidigital number, since it uses as much as digits as its factorization.

431556655121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540000, while the sum is 44.

The spelling of 431556655121 in words is "four hundred thirty-one billion, five hundred fifty-six million, six hundred fifty-five thousand, one hundred twenty-one".