97851561 has 8 divisors (see below), whose sum is σ = 132306624. Its totient is φ = 64315440.

The previous prime is 97851547. The next prime is 97851581. The reversal of 97851561 is 16515879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97851561 - 2⁵ = 97851529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97851511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229486 + ... + 229911.

It is an arithmetic number, because the mean of its divisors is an integer number (16538328).

Almost surely, 2^97851561 is an apocalyptic number.

It is an amenable number.

97851561 is a deficient number, since it is larger than the sum of its proper divisors (34455063).

97851561 is a wasteful number, since it uses less digits than its factorization.

97851561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459471.

The product of its digits is 75600, while the sum is 42.

The square root of 97851561 is about 9891.9947937714. The cubic root of 97851561 is about 460.8107331590.

The spelling of 97851561 in words is "ninety-seven million, eight hundred fifty-one thousand, five hundred sixty-one".