139742961 has 4 divisors (see below), whose sum is σ = 186323952. Its totient is φ = 93161972.

The previous prime is 139742959. The next prime is 139742971. The reversal of 139742961 is 169247931.

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 139742961 - 2¹ = 139742959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139742971) 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 in 3 ways as a sum of consecutive naturals, for example, 23290491 + ... + 23290496.

It is an arithmetic number, because the mean of its divisors is an integer number (46580988).

Almost surely, 2^139742961 is an apocalyptic number.

It is an amenable number.

139742961 is a deficient number, since it is larger than the sum of its proper divisors (46580991).

139742961 is an equidigital number, since it uses as much as digits as its factorization.

139742961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46580990.

The product of its digits is 81648, while the sum is 42.

The square root of 139742961 is about 11821.2926958095. The cubic root of 139742961 is about 518.9314361035.

The spelling of 139742961 in words is "one hundred thirty-nine million, seven hundred forty-two thousand, nine hundred sixty-one".