16191493 has 2 divisors, whose sum is σ = 16191494. Its totient is φ = 16191492.

The previous prime is 16191491. The next prime is 16191499. The reversal of 16191493 is 39419161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10125124 + 6066369 = 3182^2 + 2463^2 .

It is an emirp because it is prime and its reverse (39419161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16191493 - 2¹ = 16191491 is a prime.

Together with 16191491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16191491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095746 + 8095747.

It is an arithmetic number, because the mean of its divisors is an integer number (8095747).

Almost surely, 2^16191493 is an apocalyptic number.

It is an amenable number.

16191493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191493 is an equidigital number, since it uses as much as digits as its factorization.

16191493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 16191493 is about 4023.8654301554. The cubic root of 16191493 is about 252.9855012079.

The spelling of 16191493 in words is "sixteen million, one hundred ninety-one thousand, four hundred ninety-three".