1901801281 has 2 divisors, whose sum is σ = 1901801282. Its totient is φ = 1901801280.

The previous prime is 1901801273. The next prime is 1901801287. The reversal of 1901801281 is 1821081091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065434881 + 836366400 = 32641^2 + 28920^2 .

It is an emirp because it is prime and its reverse (1821081091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1901801281 - 2³ = 1901801273 is a prime.

It is a super-2 number, since 2×1901801281² = 7233696224826481922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1901801287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950900640 + 950900641.

It is an arithmetic number, because the mean of its divisors is an integer number (950900641).

Almost surely, 2^1901801281 is an apocalyptic number.

It is an amenable number.

1901801281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901801281 is an equidigital number, since it uses as much as digits as its factorization.

1901801281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 1901801281 is about 43609.6466507125. The cubic root of 1901801281 is about 1238.9536093031.

The spelling of 1901801281 in words is "one billion, nine hundred one million, eight hundred one thousand, two hundred eighty-one".