1861464331 has 4 divisors (see below), whose sum is σ = 1872610992. Its totient is φ = 1850317672.

The previous prime is 1861464299. The next prime is 1861464343. The reversal of 1861464331 is 1334641681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1334641681 = 19 ⋅70244299.

It is a cyclic number.

It is not a de Polignac number, because 1861464331 - 2⁵ = 1861464299 is a prime.

It is a super-2 number, since 2×1861464331² = 6930098911170555122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861464361) 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, 5573080 + ... + 5573413.

It is an arithmetic number, because the mean of its divisors is an integer number (468152748).

Almost surely, 2^1861464331 is an apocalyptic number.

1861464331 is a deficient number, since it is larger than the sum of its proper divisors (11146661).

1861464331 is a wasteful number, since it uses less digits than its factorization.

1861464331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11146660.

The product of its digits is 41472, while the sum is 37.

The square root of 1861464331 is about 43144.6906467065. The cubic root of 1861464331 is about 1230.1315943107.

The spelling of 1861464331 in words is "one billion, eight hundred sixty-one million, four hundred sixty-four thousand, three hundred thirty-one".