91144419 has 16 divisors (see below), whose sum is σ = 126904320. Its totient is φ = 58113440.

The previous prime is 91144409. The next prime is 91144441. The reversal of 91144419 is 91444119.

It is a cyclic number.

It is not a de Polignac number, because 91144419 - 2¹⁵ = 91111651 is a prime.

It is a super-2 number, since 2×91144419² = 16614610229695122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91144419.

It is not an unprimeable number, because it can be changed into a prime (91144409) 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, 4414 + ... + 14204.

It is an arithmetic number, because the mean of its divisors is an integer number (7931520).

Almost surely, 2^91144419 is an apocalyptic number.

91144419 is a deficient number, since it is larger than the sum of its proper divisors (35759901).

91144419 is a wasteful number, since it uses less digits than its factorization.

91144419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9930.

The product of its digits is 5184, while the sum is 33.

The square root of 91144419 is about 9546.9586256567. The cubic root of 91144419 is about 450.0319631617.

The spelling of 91144419 in words is "ninety-one million, one hundred forty-four thousand, four hundred nineteen".