97091561 has 8 divisors (see below), whose sum is σ = 111155520. Its totient is φ = 83076048.

The previous prime is 97091557. The next prime is 97091581. The reversal of 97091561 is 16519079.

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 97091561 - 2² = 97091557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97091531) 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, 7706 + ... + 15923.

It is an arithmetic number, because the mean of its divisors is an integer number (13894440).

Almost surely, 2^97091561 is an apocalyptic number.

It is an amenable number.

97091561 is a deficient number, since it is larger than the sum of its proper divisors (14063959).

97091561 is a wasteful number, since it uses less digits than its factorization.

97091561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24223.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 97091561 is about 9853.5050109086. The cubic root of 97091561 is about 459.6146126259.

The spelling of 97091561 in words is "ninety-seven million, ninety-one thousand, five hundred sixty-one".