91609401 has 8 divisors (see below), whose sum is σ = 131541760. Its totient is φ = 56374992.

The previous prime is 91609381. The next prime is 91609403. The reversal of 91609401 is 10490619.

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

It is not a de Polignac number, because 91609401 - 2¹⁴ = 91593017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91609403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174441 + ... + 1174518.

It is an arithmetic number, because the mean of its divisors is an integer number (16442720).

Almost surely, 2^91609401 is an apocalyptic number.

It is an amenable number.

91609401 is a deficient number, since it is larger than the sum of its proper divisors (39932359).

91609401 is a wasteful number, since it uses less digits than its factorization.

91609401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348975.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 91609401 is about 9571.2800084419. The cubic root of 91609401 is about 450.7959591800.

The spelling of 91609401 in words is "ninety-one million, six hundred nine thousand, four hundred one".