2021992649 has 2 divisors, whose sum is σ = 2021992650. Its totient is φ = 2021992648.

The previous prime is 2021992627. The next prime is 2021992751. The reversal of 2021992649 is 9462991202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420762249 + 601230400 = 37693^2 + 24520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021992649 - 2²⁸ = 1753557193 is a prime.

It is a super-2 number, since 2×2021992649² = 8176908545220074402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2011992649) 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 as a sum of consecutive naturals, namely, 1010996324 + 1010996325.

It is an arithmetic number, because the mean of its divisors is an integer number (1010996325).

Almost surely, 2^2021992649 is an apocalyptic number.

It is an amenable number.

2021992649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021992649 is an equidigital number, since it uses as much as digits as its factorization.

2021992649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 2021992649 is about 44966.5725734128. The cubic root of 2021992649 is about 1264.5223918372.

The spelling of 2021992649 in words is "two billion, twenty-one million, nine hundred ninety-two thousand, six hundred forty-nine".