81601614 has 32 divisors (see below), whose sum is σ = 181729440. Its totient is φ = 27141696.

The previous prime is 81601601. The next prime is 81601627. The reversal of 81601614 is 41610618.

It is an interprime number because it is at equal distance from previous prime (81601601) and next prime (81601627).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 28722 + ... + 31434.

It is an arithmetic number, because the mean of its divisors is an integer number (5679045).

Almost surely, 2^81601614 is an apocalyptic number.

81601614 is an abundant number, since it is smaller than the sum of its proper divisors (100127826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81601614 is a wasteful number, since it uses less digits than its factorization.

81601614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81601614 is about 9033.3611684688. The cubic root of 81601614 is about 433.7434367423.

It can be divided in two parts, 81601 and 614, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 81601614 in words is "eighty-one million, six hundred one thousand, six hundred fourteen".