91742405 has 4 divisors (see below), whose sum is σ = 110090892. Its totient is φ = 73393920.

The previous prime is 91742401. The next prime is 91742447. The reversal of 91742405 is 50424719.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61952641 + 29789764 = 7871^2 + 5458^2 .

It is not a de Polignac number, because 91742405 - 2² = 91742401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91742401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9174236 + ... + 9174245.

It is an arithmetic number, because the mean of its divisors is an integer number (27522723).

Almost surely, 2^91742405 is an apocalyptic number.

It is an amenable number.

91742405 is a deficient number, since it is larger than the sum of its proper divisors (18348487).

91742405 is a wasteful number, since it uses less digits than its factorization.

91742405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18348486.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 91742405 is about 9578.2255663562. The cubic root of 91742405 is about 451.0140178500.

The spelling of 91742405 in words is "ninety-one million, seven hundred forty-two thousand, four hundred five".