139445461 has 2 divisors, whose sum is σ = 139445462. Its totient is φ = 139445460.

The previous prime is 139445459. The next prime is 139445483. The reversal of 139445461 is 164544931.

139445461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124768900 + 14676561 = 11170^2 + 3831^2 .

It is a cyclic number.

It is not a de Polignac number, because 139445461 - 2¹ = 139445459 is a prime.

Together with 139445459, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 139445461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139442461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69722730 + 69722731.

It is an arithmetic number, because the mean of its divisors is an integer number (69722731).

Almost surely, 2^139445461 is an apocalyptic number.

It is an amenable number.

139445461 is a deficient number, since it is larger than the sum of its proper divisors (1).

139445461 is an equidigital number, since it uses as much as digits as its factorization.

139445461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 139445461 is about 11808.7027653337. The cubic root of 139445461 is about 518.5629219257.

The spelling of 139445461 in words is "one hundred thirty-nine million, four hundred forty-five thousand, four hundred sixty-one".