120409423681 has 2 divisors, whose sum is σ = 120409423682. Its totient is φ = 120409423680.

The previous prime is 120409423679. The next prime is 120409423699. The reversal of 120409423681 is 186324904021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117662720400 + 2746703281 = 343020^2 + 52409^2 .

It is a cyclic number.

It is not a de Polignac number, because 120409423681 - 2¹ = 120409423679 is a prime.

It is a super-2 number, since 2×120409423681² (a number of 23 digits) contains 22 as substring.

Together with 120409423679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (120409423081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60204711840 + 60204711841.

It is an arithmetic number, because the mean of its divisors is an integer number (60204711841).

Almost surely, 2^120409423681 is an apocalyptic number.

It is an amenable number.

120409423681 is a deficient number, since it is larger than the sum of its proper divisors (1).

120409423681 is an equidigital number, since it uses as much as digits as its factorization.

120409423681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 120409423681 in words is "one hundred twenty billion, four hundred nine million, four hundred twenty-three thousand, six hundred eighty-one".