61711261 has 4 divisors (see below), whose sum is σ = 61762624. Its totient is φ = 61659900.

The previous prime is 61711249. The next prime is 61711267. The reversal of 61711261 is 16211716.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61711261 - 2¹⁵ = 61678493 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 (61711267) 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, 23835 + ... + 26296.

It is an arithmetic number, because the mean of its divisors is an integer number (15440656).

Almost surely, 2^61711261 is an apocalyptic number.

It is an amenable number.

61711261 is a deficient number, since it is larger than the sum of its proper divisors (51363).

61711261 is a wasteful number, since it uses less digits than its factorization.

61711261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51362.

The product of its digits is 504, while the sum is 25.

The square root of 61711261 is about 7855.6515324956. The cubic root of 61711261 is about 395.1737973641.

Adding to 61711261 its reverse (16211716), we get a palindrome (77922977).

The spelling of 61711261 in words is "sixty-one million, seven hundred eleven thousand, two hundred sixty-one".