861501441 has 4 divisors (see below), whose sum is σ = 1148668592. Its totient is φ = 574334292.

The previous prime is 861501437. The next prime is 861501449. The reversal of 861501441 is 144105168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 861501441 - 2² = 861501437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861501399 and 861501408.

It is not an unprimeable number, because it can be changed into a prime (861501449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143583571 + ... + 143583576.

It is an arithmetic number, because the mean of its divisors is an integer number (287167148).

Almost surely, 2^861501441 is an apocalyptic number.

It is an amenable number.

861501441 is a deficient number, since it is larger than the sum of its proper divisors (287167151).

861501441 is a wasteful number, since it uses less digits than its factorization.

861501441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287167150.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 861501441 is about 29351.3447903158. The cubic root of 861501441 is about 951.5216393816.

The spelling of 861501441 in words is "eight hundred sixty-one million, five hundred one thousand, four hundred forty-one".