1231406920039 has 2 divisors, whose sum is σ = 1231406920040. Its totient is φ = 1231406920038.

The previous prime is 1231406920031. The next prime is 1231406920049. The reversal of 1231406920039 is 9300296041321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231406920039 - 2³ = 1231406920031 is a prime.

It is a super-2 number, since 2×1231406920039² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231406919983 and 1231406920010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231406920031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615703460019 + 615703460020.

It is an arithmetic number, because the mean of its divisors is an integer number (615703460020).

Almost surely, 2^{1231406920039} is an apocalyptic number.

1231406920039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231406920039 is an equidigital number, since it uses as much as digits as its factorization.

1231406920039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 1231406920039 in words is "one trillion, two hundred thirty-one billion, four hundred six million, nine hundred twenty thousand, thirty-nine".