1573661143 has 4 divisors (see below), whose sum is σ = 1574206128. Its totient is φ = 1573116160.

The previous prime is 1573661129. The next prime is 1573661161. The reversal of 1573661143 is 3411663751.

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 1573661143 - 2²¹ = 1571563991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1573661123) 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, 268138 + ... + 273943.

It is an arithmetic number, because the mean of its divisors is an integer number (393551532).

Almost surely, 2^1573661143 is an apocalyptic number.

1573661143 is a deficient number, since it is larger than the sum of its proper divisors (544985).

1573661143 is an equidigital number, since it uses as much as digits as its factorization.

1573661143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544984.

The product of its digits is 45360, while the sum is 37.

The square root of 1573661143 is about 39669.3980670239. The cubic root of 1573661143 is about 1163.1536122907.

The spelling of 1573661143 in words is "one billion, five hundred seventy-three million, six hundred sixty-one thousand, one hundred forty-three".