139845461 has 6 divisors (see below), whose sum is σ = 162677430. Its totient is φ = 119867496.

The previous prime is 139845457. The next prime is 139845481. The reversal of 139845461 is 164548931.

It can be written as a sum of positive squares in only one way, i.e., 122788561 + 17056900 = 11081^2 + 4130^2 .

It is not a de Polignac number, because 139845461 - 2² = 139845457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139845421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1426946 + ... + 1427043.

It is an arithmetic number, because the mean of its divisors is an integer number (27112905).

Almost surely, 2^139845461 is an apocalyptic number.

It is an amenable number.

139845461 is a deficient number, since it is larger than the sum of its proper divisors (22831969).

139845461 is an equidigital number, since it uses as much as digits as its factorization.

139845461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854003 (or 2853996 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 139845461 is about 11825.6272983720. The cubic root of 139845461 is about 519.0582820218.

The spelling of 139845461 in words is "one hundred thirty-nine million, eight hundred forty-five thousand, four hundred sixty-one".