81055075 has 6 divisors (see below), whose sum is σ = 100508324. Its totient is φ = 64844040.

The previous prime is 81055069. The next prime is 81055081. The reversal of 81055075 is 57055018.

It is an interprime number because it is at equal distance from previous prime (81055069) and next prime (81055081).

It is not a de Polignac number, because 81055075 - 2¹³ = 81046883 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, 1621077 + ... + 1621126.

Almost surely, 2^81055075 is an apocalyptic number.

81055075 is a deficient number, since it is larger than the sum of its proper divisors (19453249).

81055075 is a wasteful number, since it uses less digits than its factorization.

81055075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242213 (or 3242208 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 81055075 is about 9003.0592022934. The cubic root of 81055075 is about 432.7729129428.

The spelling of 81055075 in words is "eighty-one million, fifty-five thousand, seventy-five".