201551330501 has 4 divisors (see below), whose sum is σ = 201621879852. Its totient is φ = 201480781152.

The previous prime is 201551330483. The next prime is 201551330503. The reversal of 201551330501 is 105033155102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60777040900 + 140774289601 = 246530^2 + 375199^2 .

It is a cyclic number.

It is not a de Polignac number, because 201551330501 - 2¹⁴ = 201551314117 is a prime.

It is a super-2 number, since 2×201551330501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201551330503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35270390 + ... + 35276103.

It is an arithmetic number, because the mean of its divisors is an integer number (50405469963).

Almost surely, 2^201551330501 is an apocalyptic number.

It is an amenable number.

201551330501 is a deficient number, since it is larger than the sum of its proper divisors (70549351).

201551330501 is an equidigital number, since it uses as much as digits as its factorization.

201551330501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70549350.

The product of its (nonzero) digits is 2250, while the sum is 26.

Adding to 201551330501 its reverse (105033155102), we get a palindrome (306584485603).

The spelling of 201551330501 in words is "two hundred one billion, five hundred fifty-one million, three hundred thirty thousand, five hundred one".