15457661 has 2 divisors, whose sum is σ = 15457662. Its totient is φ = 15457660.

The previous prime is 15457657. The next prime is 15457703. The reversal of 15457661 is 16675451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 4900 = 3931^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 15457661 - 2² = 15457657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15457961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7728830 + 7728831.

It is an arithmetic number, because the mean of its divisors is an integer number (7728831).

Almost surely, 2^15457661 is an apocalyptic number.

It is an amenable number.

15457661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15457661 is an equidigital number, since it uses as much as digits as its factorization.

15457661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

The square root of 15457661 is about 3931.6232016815. The cubic root of 15457661 is about 249.1043201964.

The spelling of 15457661 in words is "fifteen million, four hundred fifty-seven thousand, six hundred sixty-one".