139513969 has 4 divisors (see below), whose sum is σ = 159444544. Its totient is φ = 119583396.

The previous prime is 139513963. The next prime is 139513993. The reversal of 139513969 is 969315931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139513969 - 2³ = 139513961 is a prime.

It is a super-2 number, since 2×139513969² = 38928295092265922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139513961) 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, 9965277 + ... + 9965290.

It is an arithmetic number, because the mean of its divisors is an integer number (39861136).

Almost surely, 2^139513969 is an apocalyptic number.

It is an amenable number.

139513969 is a deficient number, since it is larger than the sum of its proper divisors (19930575).

139513969 is an equidigital number, since it uses as much as digits as its factorization.

139513969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19930574.

The product of its digits is 196830, while the sum is 46.

The square root of 139513969 is about 11811.6031511391. The cubic root of 139513969 is about 518.6478294162.

The spelling of 139513969 in words is "one hundred thirty-nine million, five hundred thirteen thousand, nine hundred sixty-nine".