1901381 has 4 divisors (see below), whose sum is σ = 1915200. Its totient is φ = 1887564.

The previous prime is 1901377. The next prime is 1901407. The reversal of 1901381 is 1831091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1901381 - 2² = 1901377 is a prime.

It is a super-2 number, since 2×1901381² = 7230499414322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6701 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (478800).

2^1901381 is an apocalyptic number.

It is an amenable number.

1901381 is a deficient number, since it is larger than the sum of its proper divisors (13819).

1901381 is a wasteful number, since it uses less digits than its factorization.

1901381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13818.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1901381 is about 1378.9057255665. The cubic root of 1901381 is about 123.8862336706.

The spelling of 1901381 in words is "one million, nine hundred one thousand, three hundred eighty-one".