1521616142 has 4 divisors (see below), whose sum is σ = 2282424216. Its totient is φ = 760808070.

The previous prime is 1521616141. The next prime is 1521616199. The reversal of 1521616142 is 2416161251.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521616141) 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 as a sum of consecutive naturals, namely, 380404034 + ... + 380404037.

It is an arithmetic number, because the mean of its divisors is an integer number (570606054).

Almost surely, 2^1521616142 is an apocalyptic number.

1521616142 is a deficient number, since it is larger than the sum of its proper divisors (760808074).

1521616142 is an equidigital number, since it uses as much as digits as its factorization.

1521616142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760808073.

The product of its digits is 2880, while the sum is 29.

The square root of 1521616142 is about 39007.8984565947. The cubic root of 1521616142 is about 1150.1867729410.

Adding to 1521616142 its reverse (2416161251), we get a palindrome (3937777393).

The spelling of 1521616142 in words is "one billion, five hundred twenty-one million, six hundred sixteen thousand, one hundred forty-two".