139561337 has 2 divisors, whose sum is σ = 139561338. Its totient is φ = 139561336.

The previous prime is 139561267. The next prime is 139561343. The reversal of 139561337 is 733165931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85082176 + 54479161 = 9224^2 + 7381^2 .

It is an emirp because it is prime and its reverse (733165931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139561337 - 2²² = 135367033 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139561337.

It is not a weakly prime, because it can be changed into another prime (139561237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69780668 + 69780669.

It is an arithmetic number, because the mean of its divisors is an integer number (69780669).

Almost surely, 2^139561337 is an apocalyptic number.

It is an amenable number.

139561337 is a deficient number, since it is larger than the sum of its proper divisors (1).

139561337 is an equidigital number, since it uses as much as digits as its factorization.

139561337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 38.

The square root of 139561337 is about 11813.6081279176. The cubic root of 139561337 is about 518.7065201473.

The spelling of 139561337 in words is "one hundred thirty-nine million, five hundred sixty-one thousand, three hundred thirty-seven".