1200252491 has 12 divisors (see below), whose sum is σ = 1241924616. Its totient is φ = 1159860480.

The previous prime is 1200252481. The next prime is 1200252497. The reversal of 1200252491 is 1942520021.

It is not a de Polignac number, because 1200252491 - 2¹⁸ = 1199990347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200252491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200252497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176531 + ... + 183203.

It is an arithmetic number, because the mean of its divisors is an integer number (103493718).

Almost surely, 2^1200252491 is an apocalyptic number.

1200252491 is a deficient number, since it is larger than the sum of its proper divisors (41672125).

1200252491 is an equidigital number, since it uses as much as digits as its factorization.

1200252491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6862 (or 6821 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1200252491 is about 34644.6603533647. The cubic root of 1200252491 is about 1062.7330949905.

The spelling of 1200252491 in words is "one billion, two hundred million, two hundred fifty-two thousand, four hundred ninety-one".