139924997 has 2 divisors, whose sum is σ = 139924998. Its totient is φ = 139924996.

The previous prime is 139924957. The next prime is 139925003. The reversal of 139924997 is 799429931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76020961 + 63904036 = 8719^2 + 7994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139924997 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 (139924937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69962498 + 69962499.

It is an arithmetic number, because the mean of its divisors is an integer number (69962499).

Almost surely, 2^139924997 is an apocalyptic number.

It is an amenable number.

139924997 is a deficient number, since it is larger than the sum of its proper divisors (1).

139924997 is an equidigital number, since it uses as much as digits as its factorization.

139924997 is an odious number, because the sum of its binary digits is odd.

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

The square root of 139924997 is about 11828.9896863595. The cubic root of 139924997 is about 519.1566668033.

The spelling of 139924997 in words is "one hundred thirty-nine million, nine hundred twenty-four thousand, nine hundred ninety-seven".