72194853481 has 9 divisors (see below), whose sum is σ = 73039339191. Its totient is φ = 71360030544.

The previous prime is 72194853473. The next prime is 72194853541. The reversal of 72194853481 is 18435849127.

The square root of 72194853481 is 268691.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13862943081 + 58331910400 = 117741^2 + 241520^2 .

It is not a de Polignac number, because 72194853481 - 2³ = 72194853473 is a prime.

It is a super-2 number, since 2×72194853481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72194853431) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23911990 + ... + 23915008.

Almost surely, 2^72194853481 is an apocalyptic number.

72194853481 is the 268691-st square number.

72194853481 is the 134346-th centered octagonal number.

It is an amenable number.

72194853481 is a deficient number, since it is larger than the sum of its proper divisors (844485710).

72194853481 is an frugal number, since it uses more digits than its factorization.

72194853481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216 (or 3108 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 72194853481 in words is "seventy-two billion, one hundred ninety-four million, eight hundred fifty-three thousand, four hundred eighty-one".