16553531 has 2 divisors, whose sum is σ = 16553532. Its totient is φ = 16553530.

The previous prime is 16553527. The next prime is 16553533. The reversal of 16553531 is 13535561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16553531 - 2² = 16553527 is a prime.

It is a super-2 number, since 2×16553531² = 548038777135922, which contains 22 as substring.

Together with 16553533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16553494 and 16553503.

It is not a weakly prime, because it can be changed into another prime (16553533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276765 + 8276766.

It is an arithmetic number, because the mean of its divisors is an integer number (8276766).

Almost surely, 2^16553531 is an apocalyptic number.

16553531 is a deficient number, since it is larger than the sum of its proper divisors (1).

16553531 is an equidigital number, since it uses as much as digits as its factorization.

16553531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 29.

The square root of 16553531 is about 4068.6030772244. The cubic root of 16553531 is about 254.8571851848.

The spelling of 16553531 in words is "sixteen million, five hundred fifty-three thousand, five hundred thirty-one".