2099731 has 2 divisors, whose sum is σ = 2099732. Its totient is φ = 2099730.

The previous prime is 2099717. The next prime is 2099743. The reversal of 2099731 is 1379902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2099731 - 2⁹ = 2099219 is a prime.

It is a super-2 number, since 2×2099731² = 8817740544722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2099693 and 2099702.

It is not a weakly prime, because it can be changed into another prime (2099711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049865 + 1049866.

It is an arithmetic number, because the mean of its divisors is an integer number (1049866).

2^2099731 is an apocalyptic number.

2099731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099731 is an equidigital number, since it uses as much as digits as its factorization.

2099731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 2099731 is about 1449.0448578288. The cubic root of 2099731 is about 128.0524483955.

The spelling of 2099731 in words is "two million, ninety-nine thousand, seven hundred thirty-one".