139431767 has 2 divisors, whose sum is σ = 139431768. Its totient is φ = 139431766.

The previous prime is 139431763. The next prime is 139431791. The reversal of 139431767 is 767134931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139431767 - 2² = 139431763 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139431763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69715883 + 69715884.

It is an arithmetic number, because the mean of its divisors is an integer number (69715884).

Almost surely, 2^139431767 is an apocalyptic number.

139431767 is a deficient number, since it is larger than the sum of its proper divisors (1).

139431767 is an equidigital number, since it uses as much as digits as its factorization.

139431767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 139431767 is about 11808.1229244957. The cubic root of 139431767 is about 518.5459465121.

The spelling of 139431767 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, seven hundred sixty-seven".