861753997 has 4 divisors (see below), whose sum is σ = 928042780. Its totient is φ = 795465216.

The previous prime is 861753979. The next prime is 861754007. The reversal of 861753997 is 799357168.

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

It can be written as a sum of positive squares in 2 ways, for example, as 433222596 + 428531401 = 20814^2 + 20701^2 .

It is not a de Polignac number, because 861753997 - 2⁷ = 861753869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861753947) 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, 33144372 + ... + 33144397.

It is an arithmetic number, because the mean of its divisors is an integer number (232010695).

Almost surely, 2^861753997 is an apocalyptic number.

It is an amenable number.

861753997 is a deficient number, since it is larger than the sum of its proper divisors (66288783).

861753997 is a wasteful number, since it uses less digits than its factorization.

861753997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66288782.

The product of its digits is 2857680, while the sum is 55.

The square root of 861753997 is about 29355.6467651455. The cubic root of 861753997 is about 951.6146123426.

The spelling of 861753997 in words is "eight hundred sixty-one million, seven hundred fifty-three thousand, nine hundred ninety-seven".