1013521787 has 4 divisors (see below), whose sum is σ = 1014794256. Its totient is φ = 1012249320.

The previous prime is 1013521757. The next prime is 1013521823. The reversal of 1013521787 is 7871253101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1013521787 - 2¹⁶ = 1013456251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013521727) 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, 635039 + ... + 636632.

It is an arithmetic number, because the mean of its divisors is an integer number (253698564).

Almost surely, 2^1013521787 is an apocalyptic number.

1013521787 is a deficient number, since it is larger than the sum of its proper divisors (1272469).

1013521787 is an equidigital number, since it uses as much as digits as its factorization.

1013521787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272468.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 1013521787 is about 31835.8569383643. The cubic root of 1013521787 is about 1004.4870981689.

Adding to 1013521787 its reverse (7871253101), we get a palindrome (8884774888).

The spelling of 1013521787 in words is "one billion, thirteen million, five hundred twenty-one thousand, seven hundred eighty-seven".