861361450 has 12 divisors (see below), whose sum is σ = 1602132390. Its totient is φ = 344544560.

The previous prime is 861361399. The next prime is 861361453. The reversal of 861361450 is 54163168.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 722050641 + 139310809 = 26871^2 + 11803^2 .

It is a super-2 number, since 2×861361450² = 1483887095092205000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861361453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8613565 + ... + 8613664.

Almost surely, 2^861361450 is an apocalyptic number.

861361450 is a deficient number, since it is larger than the sum of its proper divisors (740770940).

861361450 is a wasteful number, since it uses less digits than its factorization.

861361450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227241 (or 17227236 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 861361450 is about 29348.9599475007. The cubic root of 861361450 is about 951.4700969328.

The spelling of 861361450 in words is "eight hundred sixty-one million, three hundred sixty-one thousand, four hundred fifty".