1491537 has 8 divisors (see below), whose sum is σ = 1994560. Its totient is φ = 991440.

The previous prime is 1491521. The next prime is 1491547. The reversal of 1491537 is 7351941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1491537 - 2⁴ = 1491521 is a prime.

It is a super-3 number, since 3×1491537³ = 9954589333561173459, which contains 333 as substring.

It is a Duffinian number.

1491537 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1491517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (249320).

2^1491537 is an apocalyptic number.

It is an amenable number.

1491537 is a deficient number, since it is larger than the sum of its proper divisors (503023).

1491537 is an equidigital number, since it uses as much as digits as its factorization.

1491537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its digits is 3780, while the sum is 30.

The square root of 1491537 is about 1221.2849790282. The cubic root of 1491537 is about 114.2557355148.

The spelling of 1491537 in words is "one million, four hundred ninety-one thousand, five hundred thirty-seven".