1521136642 has 8 divisors (see below), whose sum is σ = 2415922956. Its totient is φ = 715828992.

The previous prime is 1521136633. The next prime is 1521136663. The reversal of 1521136642 is 2466311251.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1209578841 + 311557801 = 34779^2 + 17651^2 .

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

It is an unprimeable number.

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, 22369623 + ... + 22369690.

Almost surely, 2^1521136642 is an apocalyptic number.

1521136642 is a deficient number, since it is larger than the sum of its proper divisors (894786314).

1521136642 is a wasteful number, since it uses less digits than its factorization.

1521136642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44739332.

The product of its digits is 8640, while the sum is 31.

The square root of 1521136642 is about 39001.7517811700. The cubic root of 1521136642 is about 1150.0659425325.

Adding to 1521136642 its reverse (2466311251), we get a palindrome (3987447893).

The spelling of 1521136642 in words is "one billion, five hundred twenty-one million, one hundred thirty-six thousand, six hundred forty-two".