610855891 has 4 divisors (see below), whose sum is σ = 620869984. Its totient is φ = 600841800.

The previous prime is 610855877. The next prime is 610855943. The reversal of 610855891 is 198558016.

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 610855891 - 2⁵ = 610855859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (610855841) 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, 5006955 + ... + 5007076.

It is an arithmetic number, because the mean of its divisors is an integer number (155217496).

Almost surely, 2^610855891 is an apocalyptic number.

610855891 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

610855891 is the 14270-th hex number.

610855891 is a deficient number, since it is larger than the sum of its proper divisors (10014093).

610855891 is a wasteful number, since it uses less digits than its factorization.

610855891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10014092.

The product of its (nonzero) digits is 86400, while the sum is 43.

The square root of 610855891 is about 24715.4990036616. The cubic root of 610855891 is about 848.4890763919.

The spelling of 610855891 in words is "six hundred ten million, eight hundred fifty-five thousand, eight hundred ninety-one".