3145247891 has 2 divisors, whose sum is σ = 3145247892. Its totient is φ = 3145247890.

The previous prime is 3145247813. The next prime is 3145247939. The reversal of 3145247891 is 1987425413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3145247891 is a prime.

It is not a weakly prime, because it can be changed into another prime (3145247591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1572623945 + 1572623946.

It is an arithmetic number, because the mean of its divisors is an integer number (1572623946).

Almost surely, 2^3145247891 is an apocalyptic number.

3145247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3145247891 is an equidigital number, since it uses as much as digits as its factorization.

3145247891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 3145247891 is about 56082.5096710195. The cubic root of 3145247891 is about 1465.1596840853.

The spelling of 3145247891 in words is "three billion, one hundred forty-five million, two hundred forty-seven thousand, eight hundred ninety-one".