1201551 has 8 divisors (see below), whose sum is σ = 1725360. Its totient is φ = 739392.

The previous prime is 1201531. The next prime is 1201553. The reversal of 1201551 is 1551021.

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

It is not a de Polignac number, because 1201551 - 2¹⁰ = 1200527 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1201551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15366 + ... + 15443.

It is an arithmetic number, because the mean of its divisors is an integer number (215670).

2^1201551 is an apocalyptic number.

1201551 is a deficient number, since it is larger than the sum of its proper divisors (523809).

1201551 is a wasteful number, since it uses less digits than its factorization.

1201551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30825.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 1201551 is about 1096.1528178133. The cubic root of 1201551 is about 106.3116200810.

Adding to 1201551 its reverse (1551021), we get a palindrome (2752572).

The spelling of 1201551 in words is "one million, two hundred one thousand, five hundred fifty-one".