1901082901 has 4 divisors (see below), whose sum is σ = 1906180012. Its totient is φ = 1895985792.

The previous prime is 1901082893. The next prime is 1901082941. The reversal of 1901082901 is 1092801091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1092801091 = 127 ⋅8604733.

It can be written as a sum of positive squares in 2 ways, for example, as 1313990001 + 587092900 = 36249^2 + 24230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901082901 - 2³ = 1901082893 is a prime.

It is a super-2 number, since 2×1901082901² = 7228232392949151602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901082941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2547996 + ... + 2548741.

It is an arithmetic number, because the mean of its divisors is an integer number (476545003).

Almost surely, 2^1901082901 is an apocalyptic number.

It is an amenable number.

1901082901 is a deficient number, since it is larger than the sum of its proper divisors (5097111).

1901082901 is an equidigital number, since it uses as much as digits as its factorization.

1901082901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5097110.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 1901082901 is about 43601.4093923579. The cubic root of 1901082901 is about 1238.7975902712.

Adding to 1901082901 its reverse (1092801091), we get a palindrome (2993883992).

The spelling of 1901082901 in words is "one billion, nine hundred one million, eighty-two thousand, nine hundred one".