97857791 has 4 divisors (see below), whose sum is σ = 98321784. Its totient is φ = 97393800.

The previous prime is 97857779. The next prime is 97857811. The reversal of 97857791 is 19775879.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97857791 - 2¹⁰ = 97856767 is a prime.

It is a super-2 number, since 2×97857791² = 19152294518799362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97854791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231680 + ... + 232101.

It is an arithmetic number, because the mean of its divisors is an integer number (24580446).

Almost surely, 2^97857791 is an apocalyptic number.

97857791 is a deficient number, since it is larger than the sum of its proper divisors (463993).

97857791 is a wasteful number, since it uses less digits than its factorization.

97857791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463992.

The product of its digits is 1111320, while the sum is 53.

The square root of 97857791 is about 9892.3096898550. The cubic root of 97857791 is about 460.8205125633.

It can be divided in two parts, 9785 and 7791, that added together give a cube (17576 = 26³).

The spelling of 97857791 in words is "ninety-seven million, eight hundred fifty-seven thousand, seven hundred ninety-one".