139451269 has 4 divisors (see below), whose sum is σ = 140221900. Its totient is φ = 138680640.

The previous prime is 139451233. The next prime is 139451287. The reversal of 139451269 is 962154931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14861025 + 124590244 = 3855^2 + 11162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139451269 is a prime.

It is a super-2 number, since 2×139451269² = 38893312851420722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139451069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385044 + ... + 385405.

It is an arithmetic number, because the mean of its divisors is an integer number (35055475).

Almost surely, 2^139451269 is an apocalyptic number.

It is an amenable number.

139451269 is a deficient number, since it is larger than the sum of its proper divisors (770631).

139451269 is an equidigital number, since it uses as much as digits as its factorization.

139451269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770630.

The product of its digits is 58320, while the sum is 40.

The square root of 139451269 is about 11808.9486830962. The cubic root of 139451269 is about 518.5701213274.

The spelling of 139451269 in words is "one hundred thirty-nine million, four hundred fifty-one thousand, two hundred sixty-nine".