1625513545 has 4 divisors (see below), whose sum is σ = 1950616260. Its totient is φ = 1300410832.

The previous prime is 1625513537. The next prime is 1625513567. The reversal of 1625513545 is 5453155261.

It is a happy number.

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 1169434809 + 456078736 = 34197^2 + 21356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625513545 - 2³ = 1625513537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162551350 + ... + 162551359.

It is an arithmetic number, because the mean of its divisors is an integer number (487654065).

Almost surely, 2^1625513545 is an apocalyptic number.

It is an amenable number.

1625513545 is a deficient number, since it is larger than the sum of its proper divisors (325102715).

1625513545 is an equidigital number, since it uses as much as digits as its factorization.

1625513545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325102714.

The product of its digits is 90000, while the sum is 37.

The square root of 1625513545 is about 40317.6579800960. The cubic root of 1625513545 is about 1175.7911786288.

The spelling of 1625513545 in words is "one billion, six hundred twenty-five million, five hundred thirteen thousand, five hundred forty-five".