2991869897 has 2 divisors, whose sum is σ = 2991869898. Its totient is φ = 2991869896.

The previous prime is 2991869893. The next prime is 2991869939. The reversal of 2991869897 is 7989681992.

2991869897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1864857856 + 1127012041 = 43184^2 + 33571^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991869897 - 2² = 2991869893 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991869891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495934948 + 1495934949.

It is an arithmetic number, because the mean of its divisors is an integer number (1495934949).

Almost surely, 2^2991869897 is an apocalyptic number.

It is an amenable number.

2991869897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991869897 is an equidigital number, since it uses as much as digits as its factorization.

2991869897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 68.

The square root of 2991869897 is about 54697.9880525783. The cubic root of 2991869897 is about 1440.9455429932.

The spelling of 2991869897 in words is "two billion, nine hundred ninety-one million, eight hundred sixty-nine thousand, eight hundred ninety-seven".