1521399041 has 4 divisors (see below), whose sum is σ = 1562517972. Its totient is φ = 1480280112.

The previous prime is 1521399031. The next prime is 1521399053. The reversal of 1521399041 is 1409931251.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1354240000 + 167159041 = 36800^2 + 12929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521399041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1521398992 and 1521399010.

It is not an unprimeable number, because it can be changed into a prime (1521399031) 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, 20559410 + ... + 20559483.

It is an arithmetic number, because the mean of its divisors is an integer number (390629493).

Almost surely, 2^1521399041 is an apocalyptic number.

It is an amenable number.

1521399041 is a deficient number, since it is larger than the sum of its proper divisors (41118931).

1521399041 is an equidigital number, since it uses as much as digits as its factorization.

1521399041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41118930.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1521399041 is about 39005.1155747551. The cubic root of 1521399041 is about 1150.1320682603.

The spelling of 1521399041 in words is "one billion, five hundred twenty-one million, three hundred ninety-nine thousand, forty-one".