1251521652 has 24 divisors (see below), whose sum is σ = 2921212000. Its totient is φ = 417031776.

The previous prime is 1251521647. The next prime is 1251521653. The reversal of 1251521652 is 2561251521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251521653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22599 + ... + 54897.

Almost surely, 2^1251521652 is an apocalyptic number.

1251521652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251521652 is an abundant number, since it is smaller than the sum of its proper divisors (1669690348).

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

1251521652 is a wasteful number, since it uses less digits than its factorization.

1251521652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35535 (or 35533 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 1251521652 is about 35376.8519232563. The cubic root of 1251521652 is about 1077.6542744167.

The spelling of 1251521652 in words is "one billion, two hundred fifty-one million, five hundred twenty-one thousand, six hundred fifty-two".