97447731 has 4 divisors (see below), whose sum is σ = 129930312. Its totient is φ = 64965152.

The previous prime is 97447717. The next prime is 97447733. The reversal of 97447731 is 13774479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13774479 = 3 ⋅4591493.

It is a cyclic number.

It is not a de Polignac number, because 97447731 - 2¹³ = 97439539 is a prime.

It is a super-2 number, since 2×97447731² = 18992120554096722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (97447733) 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, 16241286 + ... + 16241291.

It is an arithmetic number, because the mean of its divisors is an integer number (32482578).

Almost surely, 2^97447731 is an apocalyptic number.

97447731 is a deficient number, since it is larger than the sum of its proper divisors (32482581).

97447731 is a wasteful number, since it uses less digits than its factorization.

97447731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32482580.

The product of its digits is 148176, while the sum is 42.

The square root of 97447731 is about 9871.5617305470. The cubic root of 97447731 is about 460.1759424632.

The spelling of 97447731 in words is "ninety-seven million, four hundred forty-seven thousand, seven hundred thirty-one".