1861359413 has 4 divisors (see below), whose sum is σ = 1861454028. Its totient is φ = 1861264800.

The previous prime is 1861359349. The next prime is 1861359547. The reversal of 1861359413 is 3149531681.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1631594449 + 229764964 = 40393^2 + 15158^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861359413 - 2⁶ = 1861359349 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 (1861359713) 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, 5456 + ... + 61257.

It is an arithmetic number, because the mean of its divisors is an integer number (465363507).

Almost surely, 2^1861359413 is an apocalyptic number.

It is an amenable number.

1861359413 is a deficient number, since it is larger than the sum of its proper divisors (94615).

1861359413 is an equidigital number, since it uses as much as digits as its factorization.

1861359413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94614.

The product of its digits is 77760, while the sum is 41.

The square root of 1861359413 is about 43143.4747441603. The cubic root of 1861359413 is about 1230.1084825111.

The spelling of 1861359413 in words is "one billion, eight hundred sixty-one million, three hundred fifty-nine thousand, four hundred thirteen".