16506397 has 2 divisors, whose sum is σ = 16506398. Its totient is φ = 16506396.

The previous prime is 16506377. The next prime is 16506401. The reversal of 16506397 is 79360561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9647236 + 6859161 = 3106^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506397 - 2¹¹ = 16504349 is a prime.

It is a super-2 number, since 2×16506397² = 544922283843218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506377) 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, 8253198 + 8253199.

It is an arithmetic number, because the mean of its divisors is an integer number (8253199).

Almost surely, 2^16506397 is an apocalyptic number.

It is an amenable number.

16506397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506397 is an equidigital number, since it uses as much as digits as its factorization.

16506397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 16506397 is about 4062.8065422808. The cubic root of 16506397 is about 254.6150644772.

The spelling of 16506397 in words is "sixteen million, five hundred six thousand, three hundred ninety-seven".