2991917111 has 2 divisors, whose sum is σ = 2991917112. Its totient is φ = 2991917110.

The previous prime is 2991917101. The next prime is 2991917143. The reversal of 2991917111 is 1117191992.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2991917111 - 2²² = 2987722807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991917101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495958555 + 1495958556.

It is an arithmetic number, because the mean of its divisors is an integer number (1495958556).

Almost surely, 2^2991917111 is an apocalyptic number.

2991917111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991917111 is an equidigital number, since it uses as much as digits as its factorization.

2991917111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 41.

The square root of 2991917111 is about 54698.4196389621. The cubic root of 2991917111 is about 1440.9531226950.

The spelling of 2991917111 in words is "two billion, nine hundred ninety-one million, nine hundred seventeen thousand, one hundred eleven".