1231745071 has 2 divisors, whose sum is σ = 1231745072. Its totient is φ = 1231745070.

The previous prime is 1231745033. The next prime is 1231745089. The reversal of 1231745071 is 1705471321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231745071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231745171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615872535 + 615872536.

It is an arithmetic number, because the mean of its divisors is an integer number (615872536).

Almost surely, 2^1231745071 is an apocalyptic number.

1231745071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231745071 is an equidigital number, since it uses as much as digits as its factorization.

1231745071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 1231745071 is about 35096.2258797153. The cubic root of 1231745071 is about 1071.9477351510.

The spelling of 1231745071 in words is "one billion, two hundred thirty-one million, seven hundred forty-five thousand, seventy-one".