1861071481 has 4 divisors (see below), whose sum is σ = 1970546292. Its totient is φ = 1751596672.

The previous prime is 1861071479. The next prime is 1861071533. The reversal of 1861071481 is 1841701681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1452829456 + 408242025 = 38116^2 + 20205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861071481 - 2¹ = 1861071479 is a prime.

It is a super-2 number, since 2×1861071481² = 6927174114783066722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861071481.

It is not an unprimeable number, because it can be changed into a prime (1861471481) 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, 54737380 + ... + 54737413.

It is an arithmetic number, because the mean of its divisors is an integer number (492636573).

Almost surely, 2^1861071481 is an apocalyptic number.

It is an amenable number.

1861071481 is a deficient number, since it is larger than the sum of its proper divisors (109474811).

1861071481 is a wasteful number, since it uses less digits than its factorization.

1861071481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109474810.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 1861071481 is about 43140.1377026082. The cubic root of 1861071481 is about 1230.0450511183.

The spelling of 1861071481 in words is "one billion, eight hundred sixty-one million, seventy-one thousand, four hundred eighty-one".