91098623 has 16 divisors (see below), whose sum is σ = 114649344. Its totient is φ = 70316160.

The previous prime is 91098619. The next prime is 91098629. The reversal of 91098623 is 32689019.

It is a cyclic number.

It is not a de Polignac number, because 91098623 - 2² = 91098619 is a prime.

It is a super-2 number, since 2×91098623² = 16597918224992258, 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 (91098629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2711 + ... + 13767.

It is an arithmetic number, because the mean of its divisors is an integer number (7165584).

Almost surely, 2^91098623 is an apocalyptic number.

91098623 is a deficient number, since it is larger than the sum of its proper divisors (23550721).

91098623 is a wasteful number, since it uses less digits than its factorization.

91098623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11182.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 91098623 is about 9544.5598641320. The cubic root of 91098623 is about 449.9565768799.

The spelling of 91098623 in words is "ninety-one million, ninety-eight thousand, six hundred twenty-three".