1478570991 has 4 divisors (see below), whose sum is σ = 1971427992. Its totient is φ = 985713992.

The previous prime is 1478570963. The next prime is 1478570999. The reversal of 1478570991 is 1990758741.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1478570991 - 2¹¹ = 1478568943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1478570999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246428496 + ... + 246428501.

It is an arithmetic number, because the mean of its divisors is an integer number (492856998).

Almost surely, 2^1478570991 is an apocalyptic number.

1478570991 is a deficient number, since it is larger than the sum of its proper divisors (492857001).

1478570991 is an equidigital number, since it uses as much as digits as its factorization.

1478570991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492857000.

The product of its (nonzero) digits is 635040, while the sum is 51.

The square root of 1478570991 is about 38452.1909778884. The cubic root of 1478570991 is about 1139.2369447363.

The spelling of 1478570991 in words is "one billion, four hundred seventy-eight million, five hundred seventy thousand, nine hundred ninety-one".