1545447242 has 4 divisors (see below), whose sum is σ = 2318170866. Its totient is φ = 772723620.

The previous prime is 1545447227. The next prime is 1545447263. The reversal of 1545447242 is 2427445451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2427445451 = 3221 ⋅753631.

It can be written as a sum of positive squares in only one way, i.e., 1442404441 + 103042801 = 37979^2 + 10151^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1545447196 and 1545447205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386361809 + ... + 386361812.

Almost surely, 2^1545447242 is an apocalyptic number.

1545447242 is a deficient number, since it is larger than the sum of its proper divisors (772723624).

1545447242 is an equidigital number, since it uses as much as digits as its factorization.

1545447242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772723623.

The product of its digits is 179200, while the sum is 38.

The square root of 1545447242 is about 39312.1767649669. The cubic root of 1545447242 is about 1156.1603231662.

The spelling of 1545447242 in words is "one billion, five hundred forty-five million, four hundred forty-seven thousand, two hundred forty-two".