81349075 has 6 divisors (see below), whose sum is σ = 100872884. Its totient is φ = 65079240.

The previous prime is 81349069. The next prime is 81349123. The reversal of 81349075 is 57094318.

It is not a de Polignac number, because 81349075 - 2³ = 81349067 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1626957 + ... + 1627006.

Almost surely, 2^81349075 is an apocalyptic number.

81349075 is a deficient number, since it is larger than the sum of its proper divisors (19523809).

81349075 is a wasteful number, since it uses less digits than its factorization.

81349075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253973 (or 3253968 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81349075 is about 9019.3722065341. The cubic root of 81349075 is about 433.2955276025.

The spelling of 81349075 in words is "eighty-one million, three hundred forty-nine thousand, seventy-five".