99218761 has 2 divisors, whose sum is σ = 99218762. Its totient is φ = 99218760.

The previous prime is 99218747. The next prime is 99218771. The reversal of 99218761 is 16781299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99201600 + 17161 = 9960^2 + 131^2 .

It is an emirp because it is prime and its reverse (16781299) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99218761 is a prime.

It is equal to p_5718994 and since 99218761 and 5718994 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (99218701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49609380 + 49609381.

It is an arithmetic number, because the mean of its divisors is an integer number (49609381).

Almost surely, 2^99218761 is an apocalyptic number.

It is an amenable number.

99218761 is a deficient number, since it is larger than the sum of its proper divisors (1).

99218761 is an equidigital number, since it uses as much as digits as its factorization.

99218761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 99218761 is about 9960.8614587294. The cubic root of 99218761 is about 462.9469918649.

The spelling of 99218761 in words is "ninety-nine million, two hundred eighteen thousand, seven hundred sixty-one".