81614553 has 4 divisors (see below), whose sum is σ = 108819408. Its totient is φ = 54409700.

The previous prime is 81614551. The next prime is 81614567. The reversal of 81614553 is 35541618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81614553 - 2¹ = 81614551 is a prime.

It is a super-2 number, since 2×81614553² = 13321870522779618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81614551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13602423 + ... + 13602428.

It is an arithmetic number, because the mean of its divisors is an integer number (27204852).

Almost surely, 2^81614553 is an apocalyptic number.

It is an amenable number.

81614553 is a deficient number, since it is larger than the sum of its proper divisors (27204855).

81614553 is a wasteful number, since it uses less digits than its factorization.

81614553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27204854.

The product of its digits is 14400, while the sum is 33.

The square root of 81614553 is about 9034.0773186862. The cubic root of 81614553 is about 433.7663607567.

The spelling of 81614553 in words is "eighty-one million, six hundred fourteen thousand, five hundred fifty-three".