97406591 has 4 divisors (see below), whose sum is σ = 97990032. Its totient is φ = 96823152.

The previous prime is 97406531. The next prime is 97406599. The reversal of 97406591 is 19560479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19560479 = 79 ⋅247601.

It is a cyclic number.

It is not a de Polignac number, because 97406591 - 2¹⁸ = 97144447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97406599) 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, 291470 + ... + 291803.

It is an arithmetic number, because the mean of its divisors is an integer number (24497508).

Almost surely, 2^97406591 is an apocalyptic number.

97406591 is a deficient number, since it is larger than the sum of its proper divisors (583441).

97406591 is a wasteful number, since it uses less digits than its factorization.

97406591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583440.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 97406591 is about 9869.4777470746. The cubic root of 97406591 is about 460.1111750819. Note that the first 4 decimals are identical.

The spelling of 97406591 in words is "ninety-seven million, four hundred six thousand, five hundred ninety-one".