201511261 has 8 divisors (see below), whose sum is σ = 232579584. Its totient is φ = 171013200.

The previous prime is 201511249. The next prime is 201511267. The reversal of 201511261 is 162115102.

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

It is not a de Polignac number, because 201511261 - 2²¹ = 199414109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201511267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141805 + ... + 143218.

It is an arithmetic number, because the mean of its divisors is an integer number (29072448).

Almost surely, 2^201511261 is an apocalyptic number.

It is an amenable number.

201511261 is a deficient number, since it is larger than the sum of its proper divisors (31068323).

201511261 is a wasteful number, since it uses less digits than its factorization.

201511261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285131.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 201511261 is about 14195.4662128442. The cubic root of 201511261 is about 586.2728376893.

Adding to 201511261 its reverse (162115102), we get a palindrome (363626363).

It can be divided in two parts, 20151 and 1261, that added together give a palindrome (21412).

The spelling of 201511261 in words is "two hundred one million, five hundred eleven thousand, two hundred sixty-one".