72181091247 has 32 divisors (see below), whose sum is σ = 99456284928. Its totient is φ = 46536408576.

The previous prime is 72181091209. The next prime is 72181091273. The reversal of 72181091247 is 74219018127.

It is not a de Polignac number, because 72181091247 - 2⁷ = 72181091119 is a prime.

It is a super-3 number, since 3×72181091247³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72181091199 and 72181091208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72181091747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18029748 + ... + 18033750.

It is an arithmetic number, because the mean of its divisors is an integer number (3108008904).

Almost surely, 2^72181091247 is an apocalyptic number.

72181091247 is a deficient number, since it is larger than the sum of its proper divisors (27275193681).

72181091247 is a wasteful number, since it uses less digits than its factorization.

72181091247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399.

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 72181091247 in words is "seventy-two billion, one hundred eighty-one million, ninety-one thousand, two hundred forty-seven".