1813672261 has 4 divisors (see below), whose sum is σ = 1829722572. Its totient is φ = 1797621952.

The previous prime is 1813672229. The next prime is 1813672277. The reversal of 1813672261 is 1622763181.

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 580328100 + 1233344161 = 24090^2 + 35119^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813672261 - 2⁵ = 1813672229 is a prime.

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 1813672261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813676261) 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, 8024986 + ... + 8025211.

It is an arithmetic number, because the mean of its divisors is an integer number (457430643).

Almost surely, 2^1813672261 is an apocalyptic number.

It is an amenable number.

1813672261 is a deficient number, since it is larger than the sum of its proper divisors (16050311).

1813672261 is a wasteful number, since it uses less digits than its factorization.

1813672261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16050310.

The product of its digits is 24192, while the sum is 37.

The square root of 1813672261 is about 42587.2311966862. The cubic root of 1813672261 is about 1219.5125395133.

The spelling of 1813672261 in words is "one billion, eight hundred thirteen million, six hundred seventy-two thousand, two hundred sixty-one".