1573145641 has 4 divisors (see below), whose sum is σ = 1655942800. Its totient is φ = 1490348484.

The previous prime is 1573145627. The next prime is 1573145647. The reversal of 1573145641 is 1465413751.

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 1573145641 - 2¹⁵ = 1573112873 is a prime.

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 1573145641.

It is not an unprimeable number, because it can be changed into a prime (1573145647) 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, 41398551 + ... + 41398588.

It is an arithmetic number, because the mean of its divisors is an integer number (413985700).

Almost surely, 2^1573145641 is an apocalyptic number.

It is an amenable number.

1573145641 is a deficient number, since it is larger than the sum of its proper divisors (82797159).

1573145641 is an equidigital number, since it uses as much as digits as its factorization.

1573145641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82797158.

The product of its digits is 50400, while the sum is 37.

The square root of 1573145641 is about 39662.9000578626. The cubic root of 1573145641 is about 1163.0265892863.

The spelling of 1573145641 in words is "one billion, five hundred seventy-three million, one hundred forty-five thousand, six hundred forty-one".