1861220471 has 32 divisors (see below), whose sum is σ = 2128363776. Its totient is φ = 1612800000.

The previous prime is 1861220447. The next prime is 1861220477. The reversal of 1861220471 is 1740221681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1861220471 - 2⁶ = 1861220407 is a prime.

It is a super-3 number, since 3×1861220471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861220477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7241975 + ... + 7242231.

It is an arithmetic number, because the mean of its divisors is an integer number (66511368).

Almost surely, 2^1861220471 is an apocalyptic number.

1861220471 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1861220471 is a deficient number, since it is larger than the sum of its proper divisors (267143305).

1861220471 is a wasteful number, since it uses less digits than its factorization.

1861220471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1861220471 is about 43141.8644821941. The cubic root of 1861220471 is about 1230.0778744182.

The spelling of 1861220471 in words is "one billion, eight hundred sixty-one million, two hundred twenty thousand, four hundred seventy-one".