1491137425 has 6 divisors (see below), whose sum is σ = 1849010438. Its totient is φ = 1192909920.

The previous prime is 1491137411. The next prime is 1491137429. The reversal of 1491137425 is 5247311941.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 253223569 + 1237913856 = 15913^2 + 35184^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1491137425 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491137429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29822724 + ... + 29822773.

Almost surely, 2^1491137425 is an apocalyptic number.

It is an amenable number.

1491137425 is a deficient number, since it is larger than the sum of its proper divisors (357873013).

1491137425 is an equidigital number, since it uses as much as digits as its factorization.

1491137425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59645507 (or 59645502 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 1491137425 is about 38615.2486072536. The cubic root of 1491137425 is about 1142.4553176460.

The spelling of 1491137425 in words is "one billion, four hundred ninety-one million, one hundred thirty-seven thousand, four hundred twenty-five".