16481557 has 2 divisors, whose sum is σ = 16481558. Its totient is φ = 16481556.

The previous prime is 16481527. The next prime is 16481579. The reversal of 16481557 is 75518461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9480241 + 7001316 = 3079^2 + 2646^2 .

It is an emirp because it is prime and its reverse (75518461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16481557 - 2¹¹ = 16479509 is a prime.

It is a super-2 number, since 2×16481557² = 543283442288498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16481527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8240778 + 8240779.

It is an arithmetic number, because the mean of its divisors is an integer number (8240779).

Almost surely, 2^16481557 is an apocalyptic number.

It is an amenable number.

16481557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16481557 is an equidigital number, since it uses as much as digits as its factorization.

16481557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 16481557 is about 4059.7483912184. The cubic root of 16481557 is about 254.4872794040.

The spelling of 16481557 in words is "sixteen million, four hundred eighty-one thousand, five hundred fifty-seven".