201115254501 has 18 divisors (see below), whose sum is σ = 337928353542. Its totient is φ = 114923002320.

The previous prime is 201115254497. The next prime is 201115254517. The reversal of 201115254501 is 105452511102.

It is a happy number.

201115254501 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 152 + 5 + 4 + 501 = 666.

It can be written as a sum of positive squares in only one way, i.e., 139647953025 + 61467301476 = 373695^2 + 247926^2 .

It is not a de Polignac number, because 201115254501 - 2² = 201115254497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201115254001) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 228021390 + ... + 228022271.

It is an arithmetic number, because the mean of its divisors is an integer number (18773797419).

Almost surely, 2^201115254501 is an apocalyptic number.

201115254501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201115254501 is a deficient number, since it is larger than the sum of its proper divisors (136813099041).

201115254501 is a wasteful number, since it uses less digits than its factorization.

201115254501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456043681 (or 456043671 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 201115254501 its reverse (105452511102), we get a palindrome (306567765603).

The spelling of 201115254501 in words is "two hundred one billion, one hundred fifteen million, two hundred fifty-four thousand, five hundred one".