1901143 has 4 divisors (see below), whose sum is σ = 1907568. Its totient is φ = 1894720.

The previous prime is 1901131. The next prime is 1901147. The reversal of 1901143 is 3411091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1901143 - 2¹⁷ = 1770071 is a prime.

It is a super-2 number, since 2×1901143² = 7228689412898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1901143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901147) 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, 2746 + ... + 3367.

It is an arithmetic number, because the mean of its divisors is an integer number (476892).

2^1901143 is an apocalyptic number.

1901143 is a deficient number, since it is larger than the sum of its proper divisors (6425).

1901143 is an equidigital number, since it uses as much as digits as its factorization.

1901143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6424.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1901143 is about 1378.8194225496. The cubic root of 1901143 is about 123.8810644184.

The spelling of 1901143 in words is "one million, nine hundred one thousand, one hundred forty-three".