139991077 has 2 divisors, whose sum is σ = 139991078. Its totient is φ = 139991076.

The previous prime is 139991063. The next prime is 139991123. The reversal of 139991077 is 770199931.

It is an a-pointer prime, because the next prime (139991123) can be obtained adding 139991077 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132733441 + 7257636 = 11521^2 + 2694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139991077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139991057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69995538 + 69995539.

It is an arithmetic number, because the mean of its divisors is an integer number (69995539).

Almost surely, 2^139991077 is an apocalyptic number.

It is an amenable number.

139991077 is a deficient number, since it is larger than the sum of its proper divisors (1).

139991077 is an equidigital number, since it uses as much as digits as its factorization.

139991077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107163, while the sum is 46.

The square root of 139991077 is about 11831.7824946202. The cubic root of 139991077 is about 519.2383783734.

The spelling of 139991077 in words is "one hundred thirty-nine million, nine hundred ninety-one thousand, seventy-seven".