1971004811 has 2 divisors, whose sum is σ = 1971004812. Its totient is φ = 1971004810.

The previous prime is 1971004771. The next prime is 1971004829. The reversal of 1971004811 is 1184001791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1971004811 - 2²² = 1966810507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971006811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985502405 + 985502406.

It is an arithmetic number, because the mean of its divisors is an integer number (985502406).

Almost surely, 2^1971004811 is an apocalyptic number.

1971004811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971004811 is an equidigital number, since it uses as much as digits as its factorization.

1971004811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 1971004811 is about 44395.9999436886. Note that the first 4 decimals coincide. The cubic root of 1971004811 is about 1253.8027790455.

The spelling of 1971004811 in words is "one billion, nine hundred seventy-one million, four thousand, eight hundred eleven".