1201252509 has 6 divisors (see below), whose sum is σ = 1735142526. Its totient is φ = 800835000.

The previous prime is 1201252499. The next prime is 1201252531. The reversal of 1201252509 is 9052521021.

1201252509 is a `hidden beast` number, since 120 + 12 + 525 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1123724484 + 77528025 = 33522^2 + 8805^2 .

It is not a de Polignac number, because 1201252509 - 2⁵ = 1201252477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201252109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66736242 + ... + 66736259.

It is an arithmetic number, because the mean of its divisors is an integer number (289190421).

Almost surely, 2^1201252509 is an apocalyptic number.

It is an amenable number.

1201252509 is a deficient number, since it is larger than the sum of its proper divisors (533890017).

1201252509 is a wasteful number, since it uses less digits than its factorization.

1201252509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133472507 (or 133472504 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1201252509 is about 34659.0898466766. The cubic root of 1201252509 is about 1063.0281599086.

The spelling of 1201252509 in words is "one billion, two hundred one million, two hundred fifty-two thousand, five hundred nine".