97281731 has 4 divisors (see below), whose sum is σ = 97302432. Its totient is φ = 97261032.

The previous prime is 97281713. The next prime is 97281799. The reversal of 97281731 is 13718279.

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 97281731 - 2¹⁰ = 97280707 is a prime.

It is a super-2 number, since 2×97281731² = 18927470372712722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97281931) 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, 470 + ... + 13956.

It is an arithmetic number, because the mean of its divisors is an integer number (24325608).

Almost surely, 2^97281731 is an apocalyptic number.

97281731 is a deficient number, since it is larger than the sum of its proper divisors (20701).

97281731 is a wasteful number, since it uses less digits than its factorization.

97281731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20700.

The product of its digits is 21168, while the sum is 38.

The square root of 97281731 is about 9863.1501560100. The cubic root of 97281731 is about 459.9144941889.

The spelling of 97281731 in words is "ninety-seven million, two hundred eighty-one thousand, seven hundred thirty-one".