16649431 has 2 divisors, whose sum is σ = 16649432. Its totient is φ = 16649430.

The previous prime is 16649389. The next prime is 16649467. The reversal of 16649431 is 13494661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16649431 - 2¹¹ = 16647383 is a prime.

It is a super-2 number, since 2×16649431² = 554407105247522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16649131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324715 + 8324716.

It is an arithmetic number, because the mean of its divisors is an integer number (8324716).

Almost surely, 2^16649431 is an apocalyptic number.

16649431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16649431 is an equidigital number, since it uses as much as digits as its factorization.

16649431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 16649431 is about 4080.3714291716. The cubic root of 16649431 is about 255.3483947346.

The spelling of 16649431 in words is "sixteen million, six hundred forty-nine thousand, four hundred thirty-one".