1861670279131 has 8 divisors (see below), whose sum is σ = 2004886371600. Its totient is φ = 1718455713312.

The previous prime is 1861670279129. The next prime is 1861670279167. The reversal of 1861670279131 is 1319720761681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1861670279131 - 2¹ = 1861670279129 is a prime.

It is a super-2 number, since 2×1861670279131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861670279171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101681 + ... + 4532893.

It is an arithmetic number, because the mean of its divisors is an integer number (250610796450).

Almost surely, 2^{1861670279131} is an apocalyptic number.

1861670279131 is a deficient number, since it is larger than the sum of its proper divisors (143216092469).

1861670279131 is a wasteful number, since it uses less digits than its factorization.

1861670279131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763325.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 1861670279131 in words is "one trillion, eight hundred sixty-one billion, six hundred seventy million, two hundred seventy-nine thousand, one hundred thirty-one".