2199931691 has 2 divisors, whose sum is σ = 2199931692. Its totient is φ = 2199931690.

The previous prime is 2199931687. The next prime is 2199931703. The reversal of 2199931691 is 1961399912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2199931691 - 2² = 2199931687 is a prime.

It is a super-2 number, since 2×2199931691² = 9679398890132238962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2199931661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099965845 + 1099965846.

It is an arithmetic number, because the mean of its divisors is an integer number (1099965846).

Almost surely, 2^2199931691 is an apocalyptic number.

2199931691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199931691 is an equidigital number, since it uses as much as digits as its factorization.

2199931691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236196, while the sum is 50.

The square root of 2199931691 is about 46903.4294161951. The cubic root of 2199931691 is about 1300.5779857877.

The spelling of 2199931691 in words is "two billion, one hundred ninety-nine million, nine hundred thirty-one thousand, six hundred ninety-one".