1491878297 has 16 divisors (see below), whose sum is σ = 1861319040. Its totient is φ = 1164212352.

The previous prime is 1491878261. The next prime is 1491878393. The reversal of 1491878297 is 7928781941.

It is a cyclic number.

It is not a de Polignac number, because 1491878297 - 2⁸ = 1491878041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491878207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105647 + ... + 118932.

It is an arithmetic number, because the mean of its divisors is an integer number (116332440).

Almost surely, 2^1491878297 is an apocalyptic number.

It is an amenable number.

1491878297 is a deficient number, since it is larger than the sum of its proper divisors (369440743).

1491878297 is a wasteful number, since it uses less digits than its factorization.

1491878297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224672.

The product of its digits is 2032128, while the sum is 56.

The square root of 1491878297 is about 38624.8404139098. The cubic root of 1491878297 is about 1142.6444960544.

The spelling of 1491878297 in words is "one billion, four hundred ninety-one million, eight hundred seventy-eight thousand, two hundred ninety-seven".