97840561 has 8 divisors (see below), whose sum is σ = 120419264. Its totient is φ = 77412240.

The previous prime is 97840549. The next prime is 97840583. The reversal of 97840561 is 16504879.

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 97840561 - 2⁵ = 97840529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97840531) 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, 537495 + ... + 537676.

It is an arithmetic number, because the mean of its divisors is an integer number (15052408).

Almost surely, 2^97840561 is an apocalyptic number.

97840561 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

97840561 is a deficient number, since it is larger than the sum of its proper divisors (22578703).

97840561 is a wasteful number, since it uses less digits than its factorization.

97840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075191.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 97840561 is about 9891.4387729996. The cubic root of 97840561 is about 460.7934651394.

The spelling of 97840561 in words is "ninety-seven million, eight hundred forty thousand, five hundred sixty-one".