861946451 has 4 divisors (see below), whose sum is σ = 872331432. Its totient is φ = 851561472.

The previous prime is 861946447. The next prime is 861946471. The reversal of 861946451 is 154649168.

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

It is a cyclic number.

It is not a de Polignac number, because 861946451 - 2² = 861946447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861946441) 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, 5192366 + ... + 5192531.

It is an arithmetic number, because the mean of its divisors is an integer number (218082858).

Almost surely, 2^861946451 is an apocalyptic number.

861946451 is a deficient number, since it is larger than the sum of its proper divisors (10384981).

861946451 is a wasteful number, since it uses less digits than its factorization.

861946451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10384980.

The product of its digits is 207360, while the sum is 44.

The square root of 861946451 is about 29358.9245545541. The cubic root of 861946451 is about 951.6854478739.

The spelling of 861946451 in words is "eight hundred sixty-one million, nine hundred forty-six thousand, four hundred fifty-one".