1861335225 has 36 divisors (see below), whose sum is σ = 3336216156. Its totient is φ = 992010240.

The previous prime is 1861335211. The next prime is 1861335257. The reversal of 1861335225 is 5225331681.

1861335225 is a `hidden beast` number, since 1 + 8 + 613 + 35 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 948147264 + 913187961 = 30792^2 + 30219^2 .

It is not a de Polignac number, because 1861335225 - 2¹³ = 1861327033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1861335225.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 536697 + ... + 540153.

It is an arithmetic number, because the mean of its divisors is an integer number (92672671).

Almost surely, 2^1861335225 is an apocalyptic number.

1861335225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1861335225 is a deficient number, since it is larger than the sum of its proper divisors (1474880931).

1861335225 is a wasteful number, since it uses less digits than its factorization.

1861335225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5866 (or 5858 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1861335225 is about 43143.1944227592. The cubic root of 1861335225 is about 1230.1031541486.

The spelling of 1861335225 in words is "one billion, eight hundred sixty-one million, three hundred thirty-five thousand, two hundred twenty-five".