15450991 has 2 divisors, whose sum is σ = 15450992. Its totient is φ = 15450990.

The previous prime is 15450983. The next prime is 15451013. The reversal of 15450991 is 19905451.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19905451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15450991 - 2³ = 15450983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15450901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7725495 + 7725496.

It is an arithmetic number, because the mean of its divisors is an integer number (7725496).

Almost surely, 2^15450991 is an apocalyptic number.

15450991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15450991 is an equidigital number, since it uses as much as digits as its factorization.

15450991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 15450991 is about 3930.7748599990. The cubic root of 15450991 is about 249.0684854333.

The spelling of 15450991 in words is "fifteen million, four hundred fifty thousand, nine hundred ninety-one".