99901649 has 4 divisors (see below), whose sum is σ = 102027264. Its totient is φ = 97776036.

The previous prime is 99901621. The next prime is 99901651. The reversal of 99901649 is 94610999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94610999 = 7 ⋅13515857.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99901649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 2125567 = 99901649 / (9 + 9 + 9 + 0 + 1 + 6 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99901619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062737 + ... + 1062830.

It is an arithmetic number, because the mean of its divisors is an integer number (25506816).

Almost surely, 2^99901649 is an apocalyptic number.

It is an amenable number.

99901649 is a deficient number, since it is larger than the sum of its proper divisors (2125615).

99901649 is a wasteful number, since it uses less digits than its factorization.

99901649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125614.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 99901649 is about 9995.0812402901. The cubic root of 99901649 is about 464.0066651465.

The spelling of 99901649 in words is "ninety-nine million, nine hundred one thousand, six hundred forty-nine".