1201551213 has 8 divisors (see below), whose sum is σ = 1602229248. Its totient is φ = 800953664.

The previous prime is 1201551173. The next prime is 1201551251. The reversal of 1201551213 is 3121551021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201551213 - 2⁸ = 1201550957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201551213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201551293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43045 + ... + 65237.

It is an arithmetic number, because the mean of its divisors is an integer number (200278656).

Almost surely, 2^1201551213 is an apocalyptic number.

It is an amenable number.

1201551213 is a deficient number, since it is larger than the sum of its proper divisors (400678035).

1201551213 is a wasteful number, since it uses less digits than its factorization.

1201551213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40243.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1201551213 is about 34663.3987514208. The cubic root of 1201551213 is about 1063.1162636296.

The spelling of 1201551213 in words is "one billion, two hundred one million, five hundred fifty-one thousand, two hundred thirteen".