1525642643 has 8 divisors (see below), whose sum is σ = 1803715680. Its totient is φ = 1262600640.

The previous prime is 1525642627. The next prime is 1525642691. The reversal of 1525642643 is 3462465251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1525642643 - 2⁴ = 1525642627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1525642597 and 1525642606.

It is not an unprimeable number, because it can be changed into a prime (1525642843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3757538 + ... + 3757943.

It is an arithmetic number, because the mean of its divisors is an integer number (225464460).

Almost surely, 2^1525642643 is an apocalyptic number.

1525642643 is a deficient number, since it is larger than the sum of its proper divisors (278073037).

1525642643 is an equidigital number, since it uses as much as digits as its factorization.

1525642643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7515517.

The product of its digits is 172800, while the sum is 38.

The square root of 1525642643 is about 39059.4757133272. The cubic root of 1525642643 is about 1151.2004208657.

The spelling of 1525642643 in words is "one billion, five hundred twenty-five million, six hundred forty-two thousand, six hundred forty-three".