1901663201 has 2 divisors, whose sum is σ = 1901663202. Its totient is φ = 1901663200.

The previous prime is 1901663173. The next prime is 1901663209. The reversal of 1901663201 is 1023661091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954501025 + 947162176 = 30895^2 + 30776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901663201 - 2²² = 1897468897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1901663209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950831600 + 950831601.

It is an arithmetic number, because the mean of its divisors is an integer number (950831601).

Almost surely, 2^1901663201 is an apocalyptic number.

It is an amenable number.

1901663201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901663201 is an equidigital number, since it uses as much as digits as its factorization.

1901663201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1901663201 is about 43608.0634860114. The cubic root of 1901663201 is about 1238.9236238963.

The spelling of 1901663201 in words is "one billion, nine hundred one million, six hundred sixty-three thousand, two hundred one".