139979249 has 2 divisors, whose sum is σ = 139979250. Its totient is φ = 139979248.

The previous prime is 139979243. The next prime is 139979263. The reversal of 139979249 is 942979931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130119649 + 9859600 = 11407^2 + 3140^2 .

It is an emirp because it is prime and its reverse (942979931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139979249 - 2²⁴ = 123202033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139979249.

It is not a weakly prime, because it can be changed into another prime (139979243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69989624 + 69989625.

It is an arithmetic number, because the mean of its divisors is an integer number (69989625).

Almost surely, 2^139979249 is an apocalyptic number.

It is an amenable number.

139979249 is a deficient number, since it is larger than the sum of its proper divisors (1).

139979249 is an equidigital number, since it uses as much as digits as its factorization.

139979249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 53.

The square root of 139979249 is about 11831.2826439064. The cubic root of 139979249 is about 519.2237542877.

The spelling of 139979249 in words is "one hundred thirty-nine million, nine hundred seventy-nine thousand, two hundred forty-nine".