99121949 has 2 divisors, whose sum is σ = 99121950. Its totient is φ = 99121948.

The previous prime is 99121937. The next prime is 99121961. The reversal of 99121949 is 94912199.

It is a balanced prime because it is at equal distance from previous prime (99121937) and next prime (99121961).

It can be written as a sum of positive squares in only one way, i.e., 83265625 + 15856324 = 9125^2 + 3982^2 .

It is an emirp because it is prime and its reverse (94912199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99121949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99121909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49560974 + 49560975.

It is an arithmetic number, because the mean of its divisors is an integer number (49560975).

Almost surely, 2^99121949 is an apocalyptic number.

It is an amenable number.

99121949 is a deficient number, since it is larger than the sum of its proper divisors (1).

99121949 is an equidigital number, since it uses as much as digits as its factorization.

99121949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 44.

The square root of 99121949 is about 9956.0006528726. Note that the first 3 decimals coincide. The cubic root of 99121949 is about 462.7963704540.

The spelling of 99121949 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred forty-nine".