1491142323 has 16 divisors (see below), whose sum is σ = 2175791616. Its totient is φ = 900865440.

The previous prime is 1491142321. The next prime is 1491142357. The reversal of 1491142323 is 3232411941.

It is not a de Polignac number, because 1491142323 - 2¹ = 1491142321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491142321) 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, 60811 + ... + 81732.

It is an arithmetic number, because the mean of its divisors is an integer number (135986976).

Almost surely, 2^1491142323 is an apocalyptic number.

1491142323 is a deficient number, since it is larger than the sum of its proper divisors (684649293).

1491142323 is a wasteful number, since it uses less digits than its factorization.

1491142323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142874.

The product of its digits is 5184, while the sum is 30.

The square root of 1491142323 is about 38615.3120277436. The cubic root of 1491142323 is about 1142.4565685345.

The spelling of 1491142323 in words is "one billion, four hundred ninety-one million, one hundred forty-two thousand, three hundred twenty-three".