91430642 has 16 divisors (see below), whose sum is σ = 142037280. Its totient is φ = 44110752.

The previous prime is 91430627. The next prime is 91430653. The reversal of 91430642 is 24603419.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734 + ... + 13542.

It is an arithmetic number, because the mean of its divisors is an integer number (8877330).

Almost surely, 2^91430642 is an apocalyptic number.

91430642 is a deficient number, since it is larger than the sum of its proper divisors (50606638).

91430642 is a wasteful number, since it uses less digits than its factorization.

91430642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12937.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 91430642 is about 9561.9371468338. The cubic root of 91430642 is about 450.5025529511.

It can be divided in two parts, 9143064 and 2, that multiplied together give a triangular number (18286128 = T₆₀₄₇).

The spelling of 91430642 in words is "ninety-one million, four hundred thirty thousand, six hundred forty-two".