861491495 has 4 divisors (see below), whose sum is σ = 1033789800. Its totient is φ = 689193192.

The previous prime is 861491489. The next prime is 861491503. The reversal of 861491495 is 594194168.

861491495 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861491495 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86149145 + ... + 86149154.

It is an arithmetic number, because the mean of its divisors is an integer number (258447450).

Almost surely, 2^861491495 is an apocalyptic number.

861491495 is a deficient number, since it is larger than the sum of its proper divisors (172298305).

861491495 is a wasteful number, since it uses less digits than its factorization.

861491495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172298304.

The product of its digits is 311040, while the sum is 47.

The square root of 861491495 is about 29351.1753597705. The cubic root of 861491495 is about 951.5179776076.

The spelling of 861491495 in words is "eight hundred sixty-one million, four hundred ninety-one thousand, four hundred ninety-five".