861554 has 8 divisors (see below), whose sum is σ = 1305948. Its totient is φ = 426240.

The previous prime is 861551. The next prime is 861559. The reversal of 861554 is 455168.

It is a happy number.

861554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 5929 = 925^2 + 77^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861551) 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, 2027 + ... + 2414.

2⁸⁶¹⁵⁵⁴ is an apocalyptic number.

861554 is a deficient number, since it is larger than the sum of its proper divisors (444394).

861554 is a wasteful number, since it uses less digits than its factorization.

861554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its digits is 4800, while the sum is 29.

The square root of 861554 is about 928.1993320403. The cubic root of 861554 is about 95.1540989324.

The spelling of 861554 in words is "eight hundred sixty-one thousand, five hundred fifty-four".