451020861 has 24 divisors (see below), whose sum is σ = 673035480. Its totient is φ = 290825856.

The previous prime is 451020859. The next prime is 451020887. The reversal of 451020861 is 168020154.

451020861 is a `hidden beast` number, since 451 + 0 + 208 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 166255236 + 284765625 = 12894^2 + 16875^2 .

It is not a de Polignac number, because 451020861 - 2¹ = 451020859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451020811) 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 23 ways as a sum of consecutive naturals, for example, 53695 + ... + 61523.

It is an arithmetic number, because the mean of its divisors is an integer number (28043145).

Almost surely, 2^451020861 is an apocalyptic number.

It is an amenable number.

451020861 is a deficient number, since it is larger than the sum of its proper divisors (222014619).

451020861 is a wasteful number, since it uses less digits than its factorization.

451020861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045 (or 8042 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 451020861 is about 21237.2517289785. The cubic root of 451020861 is about 766.8884728316. Note that the first 3 decimals are identical.

The spelling of 451020861 in words is "four hundred fifty-one million, twenty thousand, eight hundred sixty-one".