16191457 has 2 divisors, whose sum is σ = 16191458. Its totient is φ = 16191456.

The previous prime is 16191451. The next prime is 16191491. The reversal of 16191457 is 75419161.

It is an a-pointer prime, because the next prime (16191491) can be obtained adding 16191457 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15374241 + 817216 = 3921^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 16191457 - 2³ = 16191449 is a prime.

It is not a weakly prime, because it can be changed into another prime (16191451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095728 + 8095729.

It is an arithmetic number, because the mean of its divisors is an integer number (8095729).

Almost surely, 2^16191457 is an apocalyptic number.

It is an amenable number.

16191457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191457 is an equidigital number, since it uses as much as digits as its factorization.

16191457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 16191457 is about 4023.8609568423. The cubic root of 16191457 is about 252.9853137126.

The spelling of 16191457 in words is "sixteen million, one hundred ninety-one thousand, four hundred fifty-seven".