1012139969 has 2 divisors, whose sum is σ = 1012139970. Its totient is φ = 1012139968.

The previous prime is 1012139959. The next prime is 1012140023. The reversal of 1012139969 is 9699312101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754216369 + 257923600 = 27463^2 + 16060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012139969 - 2¹⁶ = 1012074433 is a prime.

It is a super-2 number, since 2×1012139969² = 2048854633694641922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1012139939) 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, 506069984 + 506069985.

It is an arithmetic number, because the mean of its divisors is an integer number (506069985).

Almost surely, 2^1012139969 is an apocalyptic number.

It is an amenable number.

1012139969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012139969 is an equidigital number, since it uses as much as digits as its factorization.

1012139969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1012139969 is about 31814.1473090196. The cubic root of 1012139969 is about 1004.0303904628.

The spelling of 1012139969 in words is "one billion, twelve million, one hundred thirty-nine thousand, nine hundred sixty-nine".