1901835121 has 2 divisors, whose sum is σ = 1901835122. Its totient is φ = 1901835120.

The previous prime is 1901835107. The next prime is 1901835127. The reversal of 1901835121 is 1215381091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1645194721 + 256640400 = 40561^2 + 16020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901835121 - 2⁹ = 1901834609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1901835127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950917560 + 950917561.

It is an arithmetic number, because the mean of its divisors is an integer number (950917561).

Almost surely, 2^1901835121 is an apocalyptic number.

It is an amenable number.

1901835121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901835121 is an equidigital number, since it uses as much as digits as its factorization.

1901835121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1901835121 is about 43610.0346365375. The cubic root of 1901835121 is about 1238.9609577647.

The spelling of 1901835121 in words is "one billion, nine hundred one million, eight hundred thirty-five thousand, one hundred twenty-one".