920242591 has 4 divisors (see below), whose sum is σ = 922750432. Its totient is φ = 917734752.

The previous prime is 920242579. The next prime is 920242597. The reversal of 920242591 is 195242029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195242029 = 61 ⋅3200689.

It is a cyclic number.

It is not a de Polignac number, because 920242591 - 2²¹ = 918145439 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 (920242597) 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, 1253370 + ... + 1254103.

It is an arithmetic number, because the mean of its divisors is an integer number (230687608).

Almost surely, 2^920242591 is an apocalyptic number.

920242591 is a deficient number, since it is larger than the sum of its proper divisors (2507841).

920242591 is a wasteful number, since it uses less digits than its factorization.

920242591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507840.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 920242591 is about 30335.5005068319. The cubic root of 920242591 is about 972.6743046829.

The spelling of 920242591 in words is "nine hundred twenty million, two hundred forty-two thousand, five hundred ninety-one".