4451861 has 4 divisors (see below), whose sum is σ = 4491372. Its totient is φ = 4412352.

The previous prime is 4451849. The next prime is 4451891. The reversal of 4451861 is 1681544.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1322500 + 3129361 = 1150^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 4451861 - 2¹⁴ = 4435477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4451891) 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, 19586 + ... + 19811.

It is an arithmetic number, because the mean of its divisors is an integer number (1122843).

Almost surely, 2^4451861 is an apocalyptic number.

It is an amenable number.

4451861 is a deficient number, since it is larger than the sum of its proper divisors (39511).

4451861 is a wasteful number, since it uses less digits than its factorization.

4451861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39510.

The product of its digits is 3840, while the sum is 29.

The square root of 4451861 is about 2109.9433641688. The cubic root of 4451861 is about 164.5055414596.

The spelling of 4451861 in words is "four million, four hundred fifty-one thousand, eight hundred sixty-one".