81407497 has 8 divisors (see below), whose sum is σ = 82048736. Its totient is φ = 80769312.

The previous prime is 81407477. The next prime is 81407503. The reversal of 81407497 is 79470418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81407497 - 2¹¹ = 81405449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81407477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86413 + ... + 87349.

It is an arithmetic number, because the mean of its divisors is an integer number (10256092).

Almost surely, 2^81407497 is an apocalyptic number.

It is an amenable number.

81407497 is a deficient number, since it is larger than the sum of its proper divisors (641239).

81407497 is a wasteful number, since it uses less digits than its factorization.

81407497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81407497 is about 9022.6103207442. The cubic root of 81407497 is about 433.3992285721.

The spelling of 81407497 in words is "eighty-one million, four hundred seven thousand, four hundred ninety-seven".