15561451 has 2 divisors, whose sum is σ = 15561452. Its totient is φ = 15561450.

The previous prime is 15561449. The next prime is 15561457. The reversal of 15561451 is 15416551.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (15416551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15561451 - 2¹ = 15561449 is a prime.

Together with 15561449, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15561457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780725 + 7780726.

It is an arithmetic number, because the mean of its divisors is an integer number (7780726).

Almost surely, 2^15561451 is an apocalyptic number.

15561451 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561451 is an equidigital number, since it uses as much as digits as its factorization.

15561451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 28.

The square root of 15561451 is about 3944.8005019266. The cubic root of 15561451 is about 249.6606114702.

The spelling of 15561451 in words is "fifteen million, five hundred sixty-one thousand, four hundred fifty-one".