855610291 has 2 divisors, whose sum is σ = 855610292. Its totient is φ = 855610290.

The previous prime is 855610277. The next prime is 855610307. The reversal of 855610291 is 192016558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855610291 - 2²¹ = 853513139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855610291.

It is not a weakly prime, because it can be changed into another prime (855610891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427805145 + 427805146.

It is an arithmetic number, because the mean of its divisors is an integer number (427805146).

Almost surely, 2^855610291 is an apocalyptic number.

855610291 is a deficient number, since it is larger than the sum of its proper divisors (1).

855610291 is an equidigital number, since it uses as much as digits as its factorization.

855610291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 855610291 is about 29250.8169287629. The cubic root of 855610291 is about 949.3477668937.

The spelling of 855610291 in words is "eight hundred fifty-five million, six hundred ten thousand, two hundred ninety-one".