1904273981 has 2 divisors, whose sum is σ = 1904273982. Its totient is φ = 1904273980.

The previous prime is 1904273957. The next prime is 1904274037. The reversal of 1904273981 is 1893724091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1851580900 + 52693081 = 43030^2 + 7259^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904273981 - 2¹⁰ = 1904272957 is a prime.

It is a super-2 number, since 2×1904273981² = 7252518789427176722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1904273381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952136990 + 952136991.

It is an arithmetic number, because the mean of its divisors is an integer number (952136991).

Almost surely, 2^1904273981 is an apocalyptic number.

It is an amenable number.

1904273981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904273981 is an equidigital number, since it uses as much as digits as its factorization.

1904273981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1904273981 is about 43637.9878202467. The cubic root of 1904273981 is about 1239.4903344669.

The spelling of 1904273981 in words is "one billion, nine hundred four million, two hundred seventy-three thousand, nine hundred eighty-one".