139491701 has 2 divisors, whose sum is σ = 139491702. Its totient is φ = 139491700.

The previous prime is 139491691. The next prime is 139491731. The reversal of 139491701 is 107194931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 55860676 = 9145^2 + 7474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139491701 is a prime.

It is a super-4 number, since 4×139491701⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139491731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69745850 + 69745851.

It is an arithmetic number, because the mean of its divisors is an integer number (69745851).

Almost surely, 2^139491701 is an apocalyptic number.

It is an amenable number.

139491701 is a deficient number, since it is larger than the sum of its proper divisors (1).

139491701 is an equidigital number, since it uses as much as digits as its factorization.

139491701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 139491701 is about 11810.6604811077. The cubic root of 139491701 is about 518.6202339372.

The spelling of 139491701 in words is "one hundred thirty-nine million, four hundred ninety-one thousand, seven hundred one".