91809442 has 8 divisors (see below), whose sum is σ = 137824236. Its totient is φ = 45868032.

The previous prime is 91809439. The next prime is 91809467. The reversal of 91809442 is 24490819.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51854401 + 39955041 = 7201^2 + 6321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15103 + ... + 20290.

Almost surely, 2^91809442 is an apocalyptic number.

91809442 is a deficient number, since it is larger than the sum of its proper divisors (46014794).

91809442 is a wasteful number, since it uses less digits than its factorization.

91809442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36692.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 91809442 is about 9581.7243750799. The cubic root of 91809442 is about 451.1238444363.

The spelling of 91809442 in words is "ninety-one million, eight hundred nine thousand, four hundred forty-two".