1891363397 has 32 divisors (see below), whose sum is σ = 2413152000. Its totient is φ = 1469529600.

The previous prime is 1891363387. The next prime is 1891363403. The reversal of 1891363397 is 7933631981.

It is not a de Polignac number, because 1891363397 - 2⁴ = 1891363381 is a prime.

It is a super-2 number, since 2×1891363397² = 7154510999022759218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891363387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2146397 + ... + 2147277.

It is an arithmetic number, because the mean of its divisors is an integer number (75411000).

Almost surely, 2^1891363397 is an apocalyptic number.

It is an amenable number.

1891363397 is a deficient number, since it is larger than the sum of its proper divisors (521788603).

1891363397 is an equidigital number, since it uses as much as digits as its factorization.

1891363397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482 (or 1468 counting only the distinct ones).

The product of its digits is 734832, while the sum is 50.

The square root of 1891363397 is about 43489.8079669248. The cubic root of 1891363397 is about 1236.6828173200.

The spelling of 1891363397 in words is "one billion, eight hundred ninety-one million, three hundred sixty-three thousand, three hundred ninety-seven".