81725097 has 4 divisors (see below), whose sum is σ = 108966800. Its totient is φ = 54483396.

The previous prime is 81725081. The next prime is 81725101. The reversal of 81725097 is 79052718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81725097 - 2⁴ = 81725081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81725597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13620847 + ... + 13620852.

It is an arithmetic number, because the mean of its divisors is an integer number (27241700).

Almost surely, 2^81725097 is an apocalyptic number.

It is an amenable number.

81725097 is a deficient number, since it is larger than the sum of its proper divisors (27241703).

81725097 is a wasteful number, since it uses less digits than its factorization.

81725097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27241702.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 81725097 is about 9040.1934160725. The cubic root of 81725097 is about 433.9621127565.

The spelling of 81725097 in words is "eighty-one million, seven hundred twenty-five thousand, ninety-seven".