1901641 has 9 divisors (see below), whose sum is σ = 2223399. Its totient is φ = 1621704.

The previous prime is 1901639. The next prime is 1901651. The reversal of 1901641 is 1461091.

The square root of 1901641 is 1379.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 38416 = 1365^2 + 196^2 .

It is not a de Polignac number, because 1901641 - 2¹ = 1901639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901651) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9555 + ... + 9751.

2^1901641 is an apocalyptic number.

1901641 is the 1379-th square number.

1901641 is the 690-th centered octagonal number.

It is an amenable number.

1901641 is a deficient number, since it is larger than the sum of its proper divisors (321758).

1901641 is an frugal number, since it uses more digits than its factorization.

1901641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The cubic root of 1901641 is about 123.8918802599.

The spelling of 1901641 in words is "one million, nine hundred one thousand, six hundred forty-one".