99745381 has 2 divisors, whose sum is σ = 99745382. Its totient is φ = 99745380.

The previous prime is 99745363. The next prime is 99745433. The reversal of 99745381 is 18354799.

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., 90345025 + 9400356 = 9505^2 + 3066^2 .

It is an emirp because it is prime and its reverse (18354799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99745381 - 2⁷ = 99745253 is a prime.

It is a super-2 number, since 2×99745381² = 19898282061670322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99745981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49872690 + 49872691.

It is an arithmetic number, because the mean of its divisors is an integer number (49872691).

Almost surely, 2^99745381 is an apocalyptic number.

It is an amenable number.

99745381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99745381 is an equidigital number, since it uses as much as digits as its factorization.

99745381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 99745381 is about 9987.2609358122. The cubic root of 99745381 is about 463.7646029650.

The spelling of 99745381 in words is "ninety-nine million, seven hundred forty-five thousand, three hundred eighty-one".