1439057681 has 2 divisors, whose sum is σ = 1439057682. Its totient is φ = 1439057680.

The previous prime is 1439057677. The next prime is 1439057689. The reversal of 1439057681 is 1867509341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1039417600 + 399640081 = 32240^2 + 19991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1439057681 - 2² = 1439057677 is a prime.

It is a super-2 number, since 2×1439057681² = 4141774018490195522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1439057689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719528840 + 719528841.

It is an arithmetic number, because the mean of its divisors is an integer number (719528841).

Almost surely, 2^1439057681 is an apocalyptic number.

It is an amenable number.

1439057681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439057681 is an equidigital number, since it uses as much as digits as its factorization.

1439057681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1439057681 is about 37934.9137471011. The cubic root of 1439057681 is about 1128.9968597607.

The spelling of 1439057681 in words is "one billion, four hundred thirty-nine million, fifty-seven thousand, six hundred eighty-one".