2073181261 has 4 divisors (see below), whose sum is σ = 2144670300. Its totient is φ = 2001692224.

The previous prime is 2073181259. The next prime is 2073181267. The reversal of 2073181261 is 1621813702.

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 1316601225 + 756580036 = 36285^2 + 27506^2 .

It is a cyclic number.

It is not a de Polignac number, because 2073181261 - 2¹ = 2073181259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2073181267) 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, 35744476 + ... + 35744533.

It is an arithmetic number, because the mean of its divisors is an integer number (536167575).

Almost surely, 2^2073181261 is an apocalyptic number.

It is an amenable number.

2073181261 is a deficient number, since it is larger than the sum of its proper divisors (71489039).

2073181261 is an equidigital number, since it uses as much as digits as its factorization.

2073181261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71489038.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2073181261 is about 45532.2002653067. The cubic root of 2073181261 is about 1275.1044407077.

Adding to 2073181261 its reverse (1621813702), we get a palindrome (3694994963).

The spelling of 2073181261 in words is "two billion, seventy-three million, one hundred eighty-one thousand, two hundred sixty-one".