1525287541 has 4 divisors (see below), whose sum is σ = 1528731072. Its totient is φ = 1521844012.

The previous prime is 1525287539. The next prime is 1525287571. The reversal of 1525287541 is 1457825251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1525287541 - 2¹ = 1525287539 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1525287494 and 1525287503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525287571) 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, 1721101 + ... + 1721986.

It is an arithmetic number, because the mean of its divisors is an integer number (382182768).

Almost surely, 2^1525287541 is an apocalyptic number.

It is an amenable number.

1525287541 is a deficient number, since it is larger than the sum of its proper divisors (3443531).

1525287541 is an equidigital number, since it uses as much as digits as its factorization.

1525287541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443530.

The product of its digits is 112000, while the sum is 40.

The square root of 1525287541 is about 39054.9297912568. The cubic root of 1525287541 is about 1151.1110977873. Note that the first 3 decimals are identical.

The spelling of 1525287541 in words is "one billion, five hundred twenty-five million, two hundred eighty-seven thousand, five hundred forty-one".