1802132261 has 4 divisors (see below), whose sum is σ = 1802291724. Its totient is φ = 1801972800.

The previous prime is 1802132257. The next prime is 1802132263. The reversal of 1802132261 is 1622312081.

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 756580036 + 1045552225 = 27506^2 + 32335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1802132261 - 2² = 1802132257 is a prime.

It is a super-2 number, since 2×1802132261² = 6495361372273944242, 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 1802132261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1802132263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61370 + ... + 85851.

It is an arithmetic number, because the mean of its divisors is an integer number (450572931).

Almost surely, 2^1802132261 is an apocalyptic number.

It is an amenable number.

1802132261 is a deficient number, since it is larger than the sum of its proper divisors (159463).

1802132261 is a wasteful number, since it uses less digits than its factorization.

1802132261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159462.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1802132261 is about 42451.5283706017. The cubic root of 1802132261 is about 1216.9205370613.

The spelling of 1802132261 in words is "one billion, eight hundred two million, one hundred thirty-two thousand, two hundred sixty-one".