1380015521 has 4 divisors (see below), whose sum is σ = 1380141312. Its totient is φ = 1379889732.

The previous prime is 1380015517. The next prime is 1380015523. The reversal of 1380015521 is 1255100831.

It is a happy number.

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 1380015521 - 2² = 1380015517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380015523) 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, 44681 + ... + 68966.

It is an arithmetic number, because the mean of its divisors is an integer number (345035328).

Almost surely, 2^1380015521 is an apocalyptic number.

It is an amenable number.

1380015521 is a deficient number, since it is larger than the sum of its proper divisors (125791).

1380015521 is a wasteful number, since it uses less digits than its factorization.

1380015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125790.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1380015521 is about 37148.5601470636. The cubic root of 1380015521 is about 1113.3404554407.

The spelling of 1380015521 in words is "one billion, three hundred eighty million, fifteen thousand, five hundred twenty-one".