139191841 has 2 divisors, whose sum is σ = 139191842. Its totient is φ = 139191840.

The previous prime is 139191781. The next prime is 139191859. The reversal of 139191841 is 148191931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139145616 + 46225 = 11796^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 139191841 - 2¹⁹ = 138667553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139191841.

It is not a weakly prime, because it can be changed into another prime (139191341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69595920 + 69595921.

It is an arithmetic number, because the mean of its divisors is an integer number (69595921).

Almost surely, 2^139191841 is an apocalyptic number.

It is an amenable number.

139191841 is a deficient number, since it is larger than the sum of its proper divisors (1).

139191841 is an equidigital number, since it uses as much as digits as its factorization.

139191841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 37.

The square root of 139191841 is about 11797.9591879274. The cubic root of 139191841 is about 518.2483479414.

The spelling of 139191841 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, eight hundred forty-one".