1491732249 has 16 divisors (see below), whose sum is σ = 2275353600. Its totient is φ = 851579280.

The previous prime is 1491732227. The next prime is 1491732257. The reversal of 1491732249 is 9422371941.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1491732249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491732249.

It is not an unprimeable number, because it can be changed into a prime (1491732299) 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, 12799 + ... + 56100.

It is an arithmetic number, because the mean of its divisors is an integer number (142209600).

Almost surely, 2^1491732249 is an apocalyptic number.

It is an amenable number.

1491732249 is a deficient number, since it is larger than the sum of its proper divisors (783621351).

1491732249 is a wasteful number, since it uses less digits than its factorization.

1491732249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69940.

The product of its digits is 108864, while the sum is 42.

The square root of 1491732249 is about 38622.9497708293. The cubic root of 1491732249 is about 1142.6072082967.

The spelling of 1491732249 in words is "one billion, four hundred ninety-one million, seven hundred thirty-two thousand, two hundred forty-nine".