8456940991 has 4 divisors (see below), whose sum is σ = 8458218792. Its totient is φ = 8455663192.

The previous prime is 8456940977. The next prime is 8456941033. The reversal of 8456940991 is 1990496548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8456940991 - 2²³ = 8448552383 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 (8456940901) 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, 628921 + ... + 642226.

It is an arithmetic number, because the mean of its divisors is an integer number (2114554698).

Almost surely, 2^8456940991 is an apocalyptic number.

8456940991 is a deficient number, since it is larger than the sum of its proper divisors (1277801).

8456940991 is a wasteful number, since it uses less digits than its factorization.

8456940991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277800.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 8456940991 is about 91961.6278183461. The cubic root of 8456940991 is about 2037.3755973376.

The spelling of 8456940991 in words is "eight billion, four hundred fifty-six million, nine hundred forty thousand, nine hundred ninety-one".