497887981 has 4 divisors (see below), whose sum is σ = 499244992. Its totient is φ = 496530972.

The previous prime is 497887939. The next prime is 497887991. The reversal of 497887981 is 189788794.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 497887981 - 2⁹ = 497887469 is a prime.

It is a super-2 number, since 2×497887981² = 495784883248512722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (497887991) 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, 677955 + ... + 678688.

It is an arithmetic number, because the mean of its divisors is an integer number (124811248).

Almost surely, 2^497887981 is an apocalyptic number.

It is an amenable number.

497887981 is a deficient number, since it is larger than the sum of its proper divisors (1357011).

497887981 is a wasteful number, since it uses less digits than its factorization.

497887981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357010.

The product of its digits is 8128512, while the sum is 61.

The square root of 497887981 is about 22313.4036175569. The cubic root of 497887981 is about 792.5814083760.

The spelling of 497887981 in words is "four hundred ninety-seven million, eight hundred eighty-seven thousand, nine hundred eighty-one".