16312399 has 2 divisors, whose sum is σ = 16312400. Its totient is φ = 16312398.

The previous prime is 16312397. The next prime is 16312421. The reversal of 16312399 is 99321361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16312399 - 2¹ = 16312397 is a prime.

It is a super-2 number, since 2×16312399² = 532188722270402, which contains 22 as substring.

Together with 16312397, 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 (16312391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8156199 + 8156200.

It is an arithmetic number, because the mean of its divisors is an integer number (8156200).

Almost surely, 2^16312399 is an apocalyptic number.

16312399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16312399 is an equidigital number, since it uses as much as digits as its factorization.

16312399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 16312399 is about 4038.8611018454. The cubic root of 16312399 is about 253.6136426748.

The spelling of 16312399 in words is "sixteen million, three hundred twelve thousand, three hundred ninety-nine".