1368151491 has 12 divisors (see below), whose sum is σ = 2122031112. Its totient is φ = 781800768.

The previous prime is 1368151453. The next prime is 1368151501. The reversal of 1368151491 is 1941518631.

It is not a de Polignac number, because 1368151491 - 2⁷ = 1368151363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1368152491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4653430 + ... + 4653723.

It is an arithmetic number, because the mean of its divisors is an integer number (176835926).

Almost surely, 2^1368151491 is an apocalyptic number.

1368151491 is a deficient number, since it is larger than the sum of its proper divisors (753879621).

1368151491 is an equidigital number, since it uses as much as digits as its factorization.

1368151491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9307170 (or 9307163 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 1368151491 is about 36988.5318848964. The cubic root of 1368151491 is about 1110.1407961975.

The spelling of 1368151491 in words is "one billion, three hundred sixty-eight million, one hundred fifty-one thousand, four hundred ninety-one".