2491397389 has 8 divisors (see below), whose sum is σ = 2683867032. Its totient is φ = 2299045440.

The previous prime is 2491397387. The next prime is 2491397417. The reversal of 2491397389 is 9837931942.

It can be written as a sum of positive squares in 4 ways, for example, as 64160100 + 2427237289 = 8010^2 + 49267^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2491397389 - 2¹ = 2491397387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491397383) 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, 17307 + ... + 72679.

It is an arithmetic number, because the mean of its divisors is an integer number (335483379).

Almost surely, 2^2491397389 is an apocalyptic number.

It is an amenable number.

2491397389 is a deficient number, since it is larger than the sum of its proper divisors (192469643).

2491397389 is a wasteful number, since it uses less digits than its factorization.

2491397389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58847.

The product of its digits is 2939328, while the sum is 55.

The square root of 2491397389 is about 49913.8997574824. The cubic root of 2491397389 is about 1355.6502806841.

The spelling of 2491397389 in words is "two billion, four hundred ninety-one million, three hundred ninety-seven thousand, three hundred eighty-nine".