1213525650 has 24 divisors (see below), whose sum is σ = 3009543984. Its totient is φ = 323606800.

The previous prime is 1213525639. The next prime is 1213525673. The reversal of 1213525650 is 565253121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4044936 + ... + 4045235.

It is an arithmetic number, because the mean of its divisors is an integer number (125397666).

Almost surely, 2^1213525650 is an apocalyptic number.

1213525650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213525650 is an abundant number, since it is smaller than the sum of its proper divisors (1796018334).

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

1213525650 is a wasteful number, since it uses less digits than its factorization.

1213525650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090186 (or 8090181 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1213525650 is about 34835.6950555031. The cubic root of 1213525650 is about 1066.6362030145.

Adding to 1213525650 its reverse (565253121), we get a palindrome (1778778771).

The spelling of 1213525650 in words is "one billion, two hundred thirteen million, five hundred twenty-five thousand, six hundred fifty".