1881674261 has 2 divisors, whose sum is σ = 1881674262. Its totient is φ = 1881674260.

The previous prime is 1881674243. The next prime is 1881674273. The reversal of 1881674261 is 1624761881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191561361 + 690112900 = 34519^2 + 26270^2 .

It is an emirp because it is prime and its reverse (1624761881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881674261 - 2²² = 1877479957 is a prime.

It is a super-2 number, since 2×1881674261² = 7081396049019792242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881674161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940837130 + 940837131.

It is an arithmetic number, because the mean of its divisors is an integer number (940837131).

Almost surely, 2^1881674261 is an apocalyptic number.

It is an amenable number.

1881674261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881674261 is an equidigital number, since it uses as much as digits as its factorization.

1881674261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 44.

The square root of 1881674261 is about 43378.2694560306. The cubic root of 1881674261 is about 1234.5674283702.

The spelling of 1881674261 in words is "one billion, eight hundred eighty-one million, six hundred seventy-four thousand, two hundred sixty-one".