99072341581 has 2 divisors, whose sum is σ = 99072341582. Its totient is φ = 99072341580.

The previous prime is 99072341579. The next prime is 99072341623. The reversal of 99072341581 is 18514327099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50306452681 + 48765888900 = 224291^2 + 220830^2 .

It is a cyclic number.

It is not a de Polignac number, because 99072341581 - 2¹ = 99072341579 is a prime.

It is a super-2 number, since 2×99072341581² (a number of 23 digits) contains 22 as substring.

Together with 99072341579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99072341681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49536170790 + 49536170791.

It is an arithmetic number, because the mean of its divisors is an integer number (49536170791).

Almost surely, 2^99072341581 is an apocalyptic number.

It is an amenable number.

99072341581 is a deficient number, since it is larger than the sum of its proper divisors (1).

99072341581 is an equidigital number, since it uses as much as digits as its factorization.

99072341581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 99072341581 in words is "ninety-nine billion, seventy-two million, three hundred forty-one thousand, five hundred eighty-one".