16249381 has 2 divisors, whose sum is σ = 16249382. Its totient is φ = 16249380.

The previous prime is 16249349. The next prime is 16249391. The reversal of 16249381 is 18394261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 6421156 = 3135^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 16249381 - 2⁵ = 16249349 is a prime.

It is a super-2 number, since 2×16249381² = 528084765766322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16249391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8124690 + 8124691.

It is an arithmetic number, because the mean of its divisors is an integer number (8124691).

Almost surely, 2^16249381 is an apocalyptic number.

It is an amenable number.

16249381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16249381 is an equidigital number, since it uses as much as digits as its factorization.

16249381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 16249381 is about 4031.0520959174. The cubic root of 16249381 is about 253.2866347826.

The spelling of 16249381 in words is "sixteen million, two hundred forty-nine thousand, three hundred eighty-one".