139537477 has 2 divisors, whose sum is σ = 139537478. Its totient is φ = 139537476.

The previous prime is 139537429. The next prime is 139537487. The reversal of 139537477 is 774735931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139027681 + 509796 = 11791^2 + 714^2 .

It is an emirp because it is prime and its reverse (774735931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139537477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139537427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69768738 + 69768739.

It is an arithmetic number, because the mean of its divisors is an integer number (69768739).

Almost surely, 2^139537477 is an apocalyptic number.

It is an amenable number.

139537477 is a deficient number, since it is larger than the sum of its proper divisors (1).

139537477 is an equidigital number, since it uses as much as digits as its factorization.

139537477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555660, while the sum is 46.

The square root of 139537477 is about 11812.5982323958. The cubic root of 139537477 is about 518.6769583713.

The spelling of 139537477 in words is "one hundred thirty-nine million, five hundred thirty-seven thousand, four hundred seventy-seven".