139791526981 has 2 divisors, whose sum is σ = 139791526982. Its totient is φ = 139791526980.

The previous prime is 139791526969. The next prime is 139791527059. The reversal of 139791526981 is 189625197931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110733210756 + 29058316225 = 332766^2 + 170465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139791526981 is a prime.

It is a super-2 number, since 2×139791526981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139791526951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69895763490 + 69895763491.

It is an arithmetic number, because the mean of its divisors is an integer number (69895763491).

Almost surely, 2^139791526981 is an apocalyptic number.

It is an amenable number.

139791526981 is a deficient number, since it is larger than the sum of its proper divisors (1).

139791526981 is an equidigital number, since it uses as much as digits as its factorization.

139791526981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 61.

The spelling of 139791526981 in words is "one hundred thirty-nine billion, seven hundred ninety-one million, five hundred twenty-six thousand, nine hundred eighty-one".