91387743 has 16 divisors (see below), whose sum is σ = 125936256. Its totient is φ = 58903200.

The previous prime is 91387711. The next prime is 91387789. The reversal of 91387743 is 34778319.

It is not a de Polignac number, because 91387743 - 2⁵ = 91387711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91387695 and 91387704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91387843) 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, 15568 + ... + 20618.

It is an arithmetic number, because the mean of its divisors is an integer number (7871016).

Almost surely, 2^91387743 is an apocalyptic number.

91387743 is a deficient number, since it is larger than the sum of its proper divisors (34548513).

91387743 is a wasteful number, since it uses less digits than its factorization.

91387743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254.

The product of its digits is 127008, while the sum is 42.

The square root of 91387743 is about 9559.6936666402. The cubic root of 91387743 is about 450.4320837518.

The spelling of 91387743 in words is "ninety-one million, three hundred eighty-seven thousand, seven hundred forty-three".