1852081561 has 16 divisors (see below), whose sum is σ = 2078104896. Its totient is φ = 1636000000.

The previous prime is 1852081559. The next prime is 1852081579. The reversal of 1852081561 is 1651802581.

It is a cyclic number.

It is not a de Polignac number, because 1852081561 - 2¹ = 1852081559 is a prime.

It is a super-2 number, since 2×1852081561² = 6860412217192393442, 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 1852081561.

It is not an unprimeable number, because it can be changed into a prime (1852081501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105021 + ... + 121381.

It is an arithmetic number, because the mean of its divisors is an integer number (129881556).

Almost surely, 2^1852081561 is an apocalyptic number.

1852081561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1852081561 is a deficient number, since it is larger than the sum of its proper divisors (226023335).

1852081561 is a wasteful number, since it uses less digits than its factorization.

1852081561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16664.

The product of its (nonzero) digits is 19200, while the sum is 37.

The square root of 1852081561 is about 43035.8171875474. The cubic root of 1852081561 is about 1228.0612727917.

The spelling of 1852081561 in words is "one billion, eight hundred fifty-two million, eighty-one thousand, five hundred sixty-one".