91897042 has 4 divisors (see below), whose sum is σ = 137845566. Its totient is φ = 45948520.

The previous prime is 91897037. The next prime is 91897093. The reversal of 91897042 is 24079819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24079819 = 151 ⋅159469.

It can be written as a sum of positive squares in only one way, i.e., 78872161 + 13024881 = 8881^2 + 3609^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 91896986 and 91897004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22974259 + ... + 22974262.

Almost surely, 2^91897042 is an apocalyptic number.

91897042 is a deficient number, since it is larger than the sum of its proper divisors (45948524).

91897042 is a wasteful number, since it uses less digits than its factorization.

91897042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45948523.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 91897042 is about 9586.2944874440. The cubic root of 91897042 is about 451.2672787996.

The spelling of 91897042 in words is "ninety-one million, eight hundred ninety-seven thousand, forty-two".