81225395 has 4 divisors (see below), whose sum is σ = 97470480. Its totient is φ = 64980312.

The previous prime is 81225341. The next prime is 81225407. The reversal of 81225395 is 59352218.

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

It is a cyclic number.

It is not a de Polignac number, because 81225395 - 2¹² = 81221299 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, 8122535 + ... + 8122544.

It is an arithmetic number, because the mean of its divisors is an integer number (24367620).

Almost surely, 2^81225395 is an apocalyptic number.

81225395 is a deficient number, since it is larger than the sum of its proper divisors (16245085).

81225395 is a wasteful number, since it uses less digits than its factorization.

81225395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245084.

The product of its digits is 21600, while the sum is 35.

The square root of 81225395 is about 9012.5132454826. The cubic root of 81225395 is about 433.0758276140.

The spelling of 81225395 in words is "eighty-one million, two hundred twenty-five thousand, three hundred ninety-five".