891215383 has 2 divisors, whose sum is σ = 891215384. Its totient is φ = 891215382.

The previous prime is 891215333. The next prime is 891215389. The reversal of 891215383 is 383512198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891215383 - 2⁹ = 891214871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891215389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445607691 + 445607692.

It is an arithmetic number, because the mean of its divisors is an integer number (445607692).

Almost surely, 2^891215383 is an apocalyptic number.

891215383 is a deficient number, since it is larger than the sum of its proper divisors (1).

891215383 is an equidigital number, since it uses as much as digits as its factorization.

891215383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 891215383 is about 29853.2306961910. The cubic root of 891215383 is about 962.3378290445.

The spelling of 891215383 in words is "eight hundred ninety-one million, two hundred fifteen thousand, three hundred eighty-three".