1861057313 has 4 divisors (see below), whose sum is σ = 1878450480. Its totient is φ = 1843664148.

The previous prime is 1861057271. The next prime is 1861057343. The reversal of 1861057313 is 3137501681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1861057313 - 2¹² = 1861053217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861057343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696423 + ... + 8696636.

It is an arithmetic number, because the mean of its divisors is an integer number (469612620).

Almost surely, 2^1861057313 is an apocalyptic number.

It is an amenable number.

1861057313 is a deficient number, since it is larger than the sum of its proper divisors (17393167).

1861057313 is a wasteful number, since it uses less digits than its factorization.

1861057313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17393166.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1861057313 is about 43139.9734932696. The cubic root of 1861057313 is about 1230.0419297403.

Adding to 1861057313 its reverse (3137501681), we get a palindrome (4998558994).

The spelling of 1861057313 in words is "one billion, eight hundred sixty-one million, fifty-seven thousand, three hundred thirteen".