1491201847 has 4 divisors (see below), whose sum is σ = 1496872080. Its totient is φ = 1485531616.

The previous prime is 1491201839. The next prime is 1491201883. The reversal of 1491201847 is 7481021941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1491201847 - 2³ = 1491201839 is a prime.

It is a super-2 number, since 2×1491201847² = 4447365896992422818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491201827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834722 + ... + 2835247.

It is an arithmetic number, because the mean of its divisors is an integer number (374218020).

Almost surely, 2^1491201847 is an apocalyptic number.

1491201847 is a deficient number, since it is larger than the sum of its proper divisors (5670233).

1491201847 is an equidigital number, since it uses as much as digits as its factorization.

1491201847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670232.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1491201847 is about 38616.0827505846. The cubic root of 1491201847 is about 1142.4717700076.

The spelling of 1491201847 in words is "one billion, four hundred ninety-one million, two hundred one thousand, eight hundred forty-seven".