1523121012 has 72 divisors (see below), whose sum is σ = 4403864192. Its totient is φ = 434808000.

The previous prime is 1523120993. The next prime is 1523121029. The reversal of 1523121012 is 2101213251.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 459762 + ... + 463062.

Almost surely, 2^1523121012 is an apocalyptic number.

1523121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1523121012 is an abundant number, since it is smaller than the sum of its proper divisors (2880743180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1523121012 is a wasteful number, since it uses less digits than its factorization.

1523121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149 (or 5144 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1523121012 is about 39027.1829882711. The cubic root of 1523121012 is about 1150.5658241405.

Adding to 1523121012 its reverse (2101213251), we get a palindrome (3624334263).

The spelling of 1523121012 in words is "one billion, five hundred twenty-three million, one hundred twenty-one thousand, twelve".