1901611541 has 2 divisors, whose sum is σ = 1901611542. Its totient is φ = 1901611540.

The previous prime is 1901611511. The next prime is 1901611583. The reversal of 1901611541 is 1451161091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1582846225 + 318765316 = 39785^2 + 17854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901611541 - 2¹⁸ = 1901349397 is a prime.

It is a super-2 number, since 2×1901611541² = 7232252905728789362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901611511) 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 as a sum of consecutive naturals, namely, 950805770 + 950805771.

It is an arithmetic number, because the mean of its divisors is an integer number (950805771).

Almost surely, 2^1901611541 is an apocalyptic number.

It is an amenable number.

1901611541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901611541 is an equidigital number, since it uses as much as digits as its factorization.

1901611541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 29.

The square root of 1901611541 is about 43607.4711603413. The cubic root of 1901611541 is about 1238.9124050548.

The spelling of 1901611541 in words is "one billion, nine hundred one million, six hundred eleven thousand, five hundred forty-one".