16251493 has 2 divisors, whose sum is σ = 16251494. Its totient is φ = 16251492.

The previous prime is 16251451. The next prime is 16251511. The reversal of 16251493 is 39415261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15069924 + 1181569 = 3882^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 16251493 - 2⁹ = 16250981 is a prime.

It is a super-2 number, since 2×16251493² = 528222049458098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16251413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8125746 + 8125747.

It is an arithmetic number, because the mean of its divisors is an integer number (8125747).

Almost surely, 2^16251493 is an apocalyptic number.

It is an amenable number.

16251493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16251493 is an equidigital number, since it uses as much as digits as its factorization.

16251493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 16251493 is about 4031.3140537547. The cubic root of 16251493 is about 253.2976078815.

The spelling of 16251493 in words is "sixteen million, two hundred fifty-one thousand, four hundred ninety-three".