91855229469 has 4 divisors (see below), whose sum is σ = 122473639296. Its totient is φ = 61236819644.

The previous prime is 91855229449. The next prime is 91855229533. The reversal of 91855229469 is 96492255819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96492255819 = 3 ⋅32164085273.

It is a cyclic number.

It is not a de Polignac number, because 91855229469 - 2⁵ = 91855229437 is a prime.

It is a super-2 number, since 2×91855229469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91855229429) 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, 15309204909 + ... + 15309204914.

It is an arithmetic number, because the mean of its divisors is an integer number (30618409824).

Almost surely, 2^91855229469 is an apocalyptic number.

It is an amenable number.

91855229469 is a deficient number, since it is larger than the sum of its proper divisors (30618409827).

91855229469 is a wasteful number, since it uses less digits than its factorization.

91855229469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30618409826.

The product of its digits is 13996800, while the sum is 60.

The spelling of 91855229469 in words is "ninety-one billion, eight hundred fifty-five million, two hundred twenty-nine thousand, four hundred sixty-nine".