139074121 has 2 divisors, whose sum is σ = 139074122. Its totient is φ = 139074120.

The previous prime is 139074119. The next prime is 139074191. The reversal of 139074121 is 121470931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74046025 + 65028096 = 8605^2 + 8064^2 .

It is an emirp because it is prime and its reverse (121470931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139074121 - 2¹ = 139074119 is a prime.

It is a super-2 number, since 2×139074121² = 38683222263845282, which contains 22 as substring.

Together with 139074119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 139074121.

It is not a weakly prime, because it can be changed into another prime (139074191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69537060 + 69537061.

It is an arithmetic number, because the mean of its divisors is an integer number (69537061).

Almost surely, 2^139074121 is an apocalyptic number.

It is an amenable number.

139074121 is a deficient number, since it is larger than the sum of its proper divisors (1).

139074121 is an equidigital number, since it uses as much as digits as its factorization.

139074121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 139074121 is about 11792.9691341918. The cubic root of 139074121 is about 518.1022057486.

The spelling of 139074121 in words is "one hundred thirty-nine million, seventy-four thousand, one hundred twenty-one".