81501395 has 4 divisors (see below), whose sum is σ = 97801680. Its totient is φ = 65201112.

The previous prime is 81501389. The next prime is 81501401. The reversal of 81501395 is 59310518.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81501389) and next prime (81501401).

It is a cyclic number.

It is not a de Polignac number, because 81501395 - 2⁴ = 81501379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8150135 + ... + 8150144.

It is an arithmetic number, because the mean of its divisors is an integer number (24450420).

Almost surely, 2^81501395 is an apocalyptic number.

81501395 is a deficient number, since it is larger than the sum of its proper divisors (16300285).

81501395 is a wasteful number, since it uses less digits than its factorization.

81501395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16300284.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 81501395 is about 9027.8123042075. The cubic root of 81501395 is about 433.5657967051.

The spelling of 81501395 in words is "eighty-one million, five hundred one thousand, three hundred ninety-five".