99990973 has 2 divisors, whose sum is σ = 99990974. Its totient is φ = 99990972.

The previous prime is 99990971. The next prime is 99991009. The reversal of 99990973 is 37909999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74960964 + 25030009 = 8658^2 + 5003^2 .

It is a cyclic number.

It is not a de Polignac number, because 99990973 - 2¹ = 99990971 is a prime.

It is a super-3 number, since 3×99990973³ (a number of 25 digits) contains 333 as substring.

Together with 99990971, 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 (99990971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995486 + 49995487.

It is an arithmetic number, because the mean of its divisors is an integer number (49995487).

Almost surely, 2^99990973 is an apocalyptic number.

It is an amenable number.

99990973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990973 is an equidigital number, since it uses as much as digits as its factorization.

99990973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 99990973 is about 9999.5486398137. The cubic root of 99990973 is about 464.1449164002.

The spelling of 99990973 in words is "ninety-nine million, nine hundred ninety thousand, nine hundred seventy-three".