1573145642 has 4 divisors (see below), whose sum is σ = 2359718466. Its totient is φ = 786572820.

The previous prime is 1573145627. The next prime is 1573145647. The reversal of 1573145642 is 2465413751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2465413751 = 79 ⋅31207769.

It can be written as a sum of positive squares in only one way, i.e., 1564914481 + 8231161 = 39559^2 + 2869^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1573145596 and 1573145605.

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 as a sum of consecutive naturals, namely, 393286409 + ... + 393286412.

Almost surely, 2^1573145642 is an apocalyptic number.

1573145642 is a deficient number, since it is larger than the sum of its proper divisors (786572824).

1573145642 is an equidigital number, since it uses as much as digits as its factorization.

1573145642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786572823.

The product of its digits is 100800, while the sum is 38.

The square root of 1573145642 is about 39662.9000704689. The cubic root of 1573145642 is about 1163.0265895328.

The spelling of 1573145642 in words is "one billion, five hundred seventy-three million, one hundred forty-five thousand, six hundred forty-two".