861471723 has 32 divisors (see below), whose sum is σ = 1395555840. Its totient is φ = 461721600.

The previous prime is 861471649. The next prime is 861471727. The reversal of 861471723 is 327174168.

It is a de Polignac number, because none of the positive numbers 2^k-861471723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861471727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29611 + ... + 50987.

It is an arithmetic number, because the mean of its divisors is an integer number (43611120).

Almost surely, 2^861471723 is an apocalyptic number.

861471723 is a deficient number, since it is larger than the sum of its proper divisors (534084117).

861471723 is a wasteful number, since it uses less digits than its factorization.

861471723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21507.

The product of its digits is 56448, while the sum is 39.

The square root of 861471723 is about 29350.8385399804. The cubic root of 861471723 is about 951.5106981558.

The spelling of 861471723 in words is "eight hundred sixty-one million, four hundred seventy-one thousand, seven hundred twenty-three".