861547254 has 16 divisors (see below), whose sum is σ = 1782511920. Its totient is φ = 277279520.

The previous prime is 861547237. The next prime is 861547279. The reversal of 861547254 is 452745168.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2475537 + ... + 2475884.

It is an arithmetic number, because the mean of its divisors is an integer number (111406995).

Almost surely, 2^861547254 is an apocalyptic number.

861547254 is an abundant number, since it is smaller than the sum of its proper divisors (920964666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861547254 is a wasteful number, since it uses less digits than its factorization.

861547254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951455.

The product of its digits is 268800, while the sum is 42.

The square root of 861547254 is about 29352.1252041483. The cubic root of 861547254 is about 951.5385057833.

The spelling of 861547254 in words is "eight hundred sixty-one million, five hundred forty-seven thousand, two hundred fifty-four".