139981697061 has 4 divisors (see below), whose sum is σ = 186642262752. Its totient is φ = 93321131372.

The previous prime is 139981697047. The next prime is 139981697071. The reversal of 139981697061 is 160796189931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139981697061 - 2²⁷ = 139847479333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139981696986 and 139981697004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139981697071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23330282841 + ... + 23330282846.

It is an arithmetic number, because the mean of its divisors is an integer number (46660565688).

Almost surely, 2^139981697061 is an apocalyptic number.

It is an amenable number.

139981697061 is a deficient number, since it is larger than the sum of its proper divisors (46660565691).

139981697061 is an equidigital number, since it uses as much as digits as its factorization.

139981697061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46660565690.

The product of its (nonzero) digits is 4408992, while the sum is 60.

The spelling of 139981697061 in words is "one hundred thirty-nine billion, nine hundred eighty-one million, six hundred ninety-seven thousand, sixty-one".