1625445013 has 4 divisors (see below), whose sum is σ = 1627581708. Its totient is φ = 1623308320.

The previous prime is 1625445007. The next prime is 1625445037. The reversal of 1625445013 is 3105445261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3105445261 = 37 ⋅83930953.

It can be written as a sum of positive squares in 2 ways, for example, as 28483569 + 1596961444 = 5337^2 + 39962^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625445013 - 2⁵ = 1625444981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625445313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067206 + ... + 1068727.

It is an arithmetic number, because the mean of its divisors is an integer number (406895427).

Almost surely, 2^1625445013 is an apocalyptic number.

It is an amenable number.

1625445013 is a deficient number, since it is larger than the sum of its proper divisors (2136695).

1625445013 is an equidigital number, since it uses as much as digits as its factorization.

1625445013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136694.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1625445013 is about 40316.8080705802. The cubic root of 1625445013 is about 1175.7746545270.

The spelling of 1625445013 in words is "one billion, six hundred twenty-five million, four hundred forty-five thousand, thirteen".