1904121797 has 2 divisors, whose sum is σ = 1904121798. Its totient is φ = 1904121796.

The previous prime is 1904121761. The next prime is 1904121823. The reversal of 1904121797 is 7971214091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1419857761 + 484264036 = 37681^2 + 22006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904121797 - 2¹⁸ = 1903859653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1904121497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952060898 + 952060899.

It is an arithmetic number, because the mean of its divisors is an integer number (952060899).

Almost surely, 2^1904121797 is an apocalyptic number.

It is an amenable number.

1904121797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904121797 is an equidigital number, since it uses as much as digits as its factorization.

1904121797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 1904121797 is about 43636.2440753097. The cubic root of 1904121797 is about 1239.4573147747.

The spelling of 1904121797 in words is "one billion, nine hundred four million, one hundred twenty-one thousand, seven hundred ninety-seven".