2012157261 has 16 divisors (see below), whose sum is σ = 2985635520. Its totient is φ = 1339340400.

The previous prime is 2012157229. The next prime is 2012157293. The reversal of 2012157261 is 1627512102.

2012157261 is a `hidden beast` number, since 20 + 12 + 1 + 572 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (2012157229) and next prime (2012157293).

It is not a de Polignac number, because 2012157261 - 2⁵ = 2012157229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012157211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40590 + ... + 75311.

It is an arithmetic number, because the mean of its divisors is an integer number (186602220).

Almost surely, 2^2012157261 is an apocalyptic number.

It is an amenable number.

2012157261 is a deficient number, since it is larger than the sum of its proper divisors (973478259).

2012157261 is a wasteful number, since it uses less digits than its factorization.

2012157261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116553 (or 116547 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 2012157261 is about 44857.0759301139. The cubic root of 2012157261 is about 1262.4687594923.

Adding to 2012157261 its reverse (1627512102), we get a palindrome (3639669363).

The spelling of 2012157261 in words is "two billion, twelve million, one hundred fifty-seven thousand, two hundred sixty-one".