1491578907 has 64 divisors (see below), whose sum is σ = 2588544000. Its totient is φ = 741892608.

The previous prime is 1491578899. The next prime is 1491578923. The reversal of 1491578907 is 7098751941.

It is a happy number.

1491578907 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1491578907 - 2³ = 1491578899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491578907.

It is not an unprimeable number, because it can be changed into a prime (1491578927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1394769 + ... + 1395837.

It is an arithmetic number, because the mean of its divisors is an integer number (40446000).

Almost surely, 2^1491578907 is an apocalyptic number.

1491578907 is a deficient number, since it is larger than the sum of its proper divisors (1096965093).

1491578907 is a wasteful number, since it uses less digits than its factorization.

1491578907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

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

The square root of 1491578907 is about 38620.9646047325. The cubic root of 1491578907 is about 1142.5680556766.

The spelling of 1491578907 in words is "one billion, four hundred ninety-one million, five hundred seventy-eight thousand, nine hundred seven".