16139969 has 2 divisors, whose sum is σ = 16139970. Its totient is φ = 16139968.

The previous prime is 16139939. The next prime is 16139971. The reversal of 16139969 is 96993161.

It is a happy number.

16139969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 640000 = 3937^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 16139969 - 2⁸ = 16139713 is a prime.

It is a super-2 number, since 2×16139969² = 520997198641922, which contains 22 as substring.

Together with 16139971, 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 (16139939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8069984 + 8069985.

It is an arithmetic number, because the mean of its divisors is an integer number (8069985).

Almost surely, 2^16139969 is an apocalyptic number.

It is an amenable number.

16139969 is a deficient number, since it is larger than the sum of its proper divisors (1).

16139969 is an equidigital number, since it uses as much as digits as its factorization.

16139969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 16139969 is about 4017.4580271610. The cubic root of 16139969 is about 252.7168688716.

The spelling of 16139969 in words is "sixteen million, one hundred thirty-nine thousand, nine hundred sixty-nine".