16391761 has 2 divisors, whose sum is σ = 16391762. Its totient is φ = 16391760.

The previous prime is 16391743. The next prime is 16391797. The reversal of 16391761 is 16719361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 231361 = 4020^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 16391761 - 2⁷ = 16391633 is a prime.

It is a super-2 number, since 2×16391761² = 537379657362242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16391701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195880 + 8195881.

It is an arithmetic number, because the mean of its divisors is an integer number (8195881).

Almost surely, 2^16391761 is an apocalyptic number.

It is an amenable number.

16391761 is a deficient number, since it is larger than the sum of its proper divisors (1).

16391761 is an equidigital number, since it uses as much as digits as its factorization.

16391761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 16391761 is about 4048.6739804534. The cubic root of 16391761 is about 254.0242655636.

The spelling of 16391761 in words is "sixteen million, three hundred ninety-one thousand, seven hundred sixty-one".