81697045 has 16 divisors (see below), whose sum is σ = 100465920. Its totient is φ = 63747904.

The previous prime is 81697043. The next prime is 81697103. The reversal of 81697045 is 54079618.

It is a cyclic number.

It is not a de Polignac number, because 81697045 - 2¹ = 81697043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81696989 and 81697007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81697043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119274 + ... + 119956.

It is an arithmetic number, because the mean of its divisors is an integer number (6279120).

Almost surely, 2^81697045 is an apocalyptic number.

It is an amenable number.

81697045 is a deficient number, since it is larger than the sum of its proper divisors (18768875).

81697045 is a wasteful number, since it uses less digits than its factorization.

81697045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 81697045 is about 9038.6417674339. The cubic root of 81697045 is about 433.9124548230.

The spelling of 81697045 in words is "eighty-one million, six hundred ninety-seven thousand, forty-five".