1545138473 has 4 divisors (see below), whose sum is σ = 1598419140. Its totient is φ = 1491857808.

The previous prime is 1545138457. The next prime is 1545138499. The reversal of 1545138473 is 3748315451.

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

It can be written as a sum of positive squares in 2 ways, for example, as 962736784 + 582401689 = 31028^2 + 24133^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545138473 - 2⁴ = 1545138457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1545138473.

It is not an unprimeable number, because it can be changed into a prime (1545138443) 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, 26640290 + ... + 26640347.

It is an arithmetic number, because the mean of its divisors is an integer number (399604785).

Almost surely, 2^1545138473 is an apocalyptic number.

It is an amenable number.

1545138473 is a deficient number, since it is larger than the sum of its proper divisors (53280667).

1545138473 is an equidigital number, since it uses as much as digits as its factorization.

1545138473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53280666.

The product of its digits is 201600, while the sum is 41.

The square root of 1545138473 is about 39308.2494268061. The cubic root of 1545138473 is about 1156.0833205929.

The spelling of 1545138473 in words is "one billion, five hundred forty-five million, one hundred thirty-eight thousand, four hundred seventy-three".