1298357887 has 2 divisors, whose sum is σ = 1298357888. Its totient is φ = 1298357886.

The previous prime is 1298357833. The next prime is 1298357891. The reversal of 1298357887 is 7887538921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1298357887 - 2¹⁹ = 1297833599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1298357807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649178943 + 649178944.

It is an arithmetic number, because the mean of its divisors is an integer number (649178944).

Almost surely, 2^1298357887 is an apocalyptic number.

1298357887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298357887 is an equidigital number, since it uses as much as digits as its factorization.

1298357887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The square root of 1298357887 is about 36032.7335488164. The cubic root of 1298357887 is about 1090.9331534248.

The spelling of 1298357887 in words is "one billion, two hundred ninety-eight million, three hundred fifty-seven thousand, eight hundred eighty-seven".