73900091 has 4 divisors (see below), whose sum is σ = 76448400. Its totient is φ = 71351784.

The previous prime is 73900069. The next prime is 73900103. The reversal of 73900091 is 19000937.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73900091 - 2²² = 69705787 is a prime.

It is a super-2 number, since 2×73900091² = 10922446899616562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2548279 = 73900091 / (7 + 3 + 9 + 0 + 0 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73900031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274111 + ... + 1274168.

It is an arithmetic number, because the mean of its divisors is an integer number (19112100).

Almost surely, 2^73900091 is an apocalyptic number.

73900091 is a deficient number, since it is larger than the sum of its proper divisors (2548309).

73900091 is a wasteful number, since it uses less digits than its factorization.

73900091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548308.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 73900091 is about 8596.5162129784. The cubic root of 73900091 is about 419.6446181247.

The spelling of 73900091 in words is "seventy-three million, nine hundred thousand, ninety-one".