1491362489 has 4 divisors (see below), whose sum is σ = 1491444480. Its totient is φ = 1491280500.

The previous prime is 1491362473. The next prime is 1491362491. The reversal of 1491362489 is 9842631941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9842631941 = 83 ⋅118585927.

It is a cyclic number.

It is not a de Polignac number, because 1491362489 - 2⁴ = 1491362473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491362419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137 + ... + 54614.

It is an arithmetic number, because the mean of its divisors is an integer number (372861120).

Almost surely, 2^1491362489 is an apocalyptic number.

It is an amenable number.

1491362489 is a deficient number, since it is larger than the sum of its proper divisors (81991).

1491362489 is an equidigital number, since it uses as much as digits as its factorization.

1491362489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81990.

The product of its digits is 373248, while the sum is 47.

The square root of 1491362489 is about 38618.1626828621. The cubic root of 1491362489 is about 1142.5127933742.

The spelling of 1491362489 in words is "one billion, four hundred ninety-one million, three hundred sixty-two thousand, four hundred eighty-nine".