1531120139 has 2 divisors, whose sum is σ = 1531120140. Its totient is φ = 1531120138.

The previous prime is 1531120121. The next prime is 1531120141. The reversal of 1531120139 is 9310211351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531120139 - 2²⁴ = 1514342923 is a prime.

It is a super-3 number, since 3×1531120139³ (a number of 29 digits) contains 333 as substring.

Together with 1531120141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1531120169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765560069 + 765560070.

It is an arithmetic number, because the mean of its divisors is an integer number (765560070).

Almost surely, 2^1531120139 is an apocalyptic number.

1531120139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531120139 is an equidigital number, since it uses as much as digits as its factorization.

1531120139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 1531120139 is about 39129.5302680725. The cubic root of 1531120139 is about 1152.5764889170.

The spelling of 1531120139 in words is "one billion, five hundred thirty-one million, one hundred twenty thousand, one hundred thirty-nine".