1231401811 has 2 divisors, whose sum is σ = 1231401812. Its totient is φ = 1231401810.

The previous prime is 1231401767. The next prime is 1231401823. The reversal of 1231401811 is 1181041321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231401811 - 2²⁷ = 1097184083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231405811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615700905 + 615700906.

It is an arithmetic number, because the mean of its divisors is an integer number (615700906).

Almost surely, 2^1231401811 is an apocalyptic number.

1231401811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231401811 is an equidigital number, since it uses as much as digits as its factorization.

1231401811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1231401811 is about 35091.3352695505. The cubic root of 1231401811 is about 1071.8481498894.

The spelling of 1231401811 in words is "one billion, two hundred thirty-one million, four hundred one thousand, eight hundred eleven".