1248595891 has 2 divisors, whose sum is σ = 1248595892. Its totient is φ = 1248595890.

The previous prime is 1248595867. The next prime is 1248595903. The reversal of 1248595891 is 1985958421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1985958421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248595891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1248595861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624297945 + 624297946.

It is an arithmetic number, because the mean of its divisors is an integer number (624297946).

Almost surely, 2^1248595891 is an apocalyptic number.

1248595891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248595891 is an equidigital number, since it uses as much as digits as its factorization.

1248595891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 52.

The square root of 1248595891 is about 35335.4763799782. The cubic root of 1248595891 is about 1076.8138524138.

The spelling of 1248595891 in words is "one billion, two hundred forty-eight million, five hundred ninety-five thousand, eight hundred ninety-one".