91425643 has 4 divisors (see below), whose sum is σ = 96803640. Its totient is φ = 86047648.

The previous prime is 91425637. The next prime is 91425683. The reversal of 91425643 is 34652419.

It is a happy number.

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 91425643 - 2¹⁷ = 91294571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91425599 and 91425608.

It is not an unprimeable number, because it can be changed into a prime (91425683) 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, 2688973 + ... + 2689006.

It is an arithmetic number, because the mean of its divisors is an integer number (24200910).

Almost surely, 2^91425643 is an apocalyptic number.

91425643 is a deficient number, since it is larger than the sum of its proper divisors (5377997).

91425643 is a wasteful number, since it uses less digits than its factorization.

91425643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377996.

The product of its digits is 25920, while the sum is 34.

The square root of 91425643 is about 9561.6757422536. The cubic root of 91425643 is about 450.4943423437.

The spelling of 91425643 in words is "ninety-one million, four hundred twenty-five thousand, six hundred forty-three".