61511 has 2 divisors, whose sum is σ = 61512. Its totient is φ = 61510.

The previous prime is 61507. The next prime is 61519. The reversal of 61511 is 11516.

61511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61511 - 2² = 61507 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755 + 30756.

It is an arithmetic number, because the mean of its divisors is an integer number (30756).

2⁶¹⁵¹¹ is an apocalyptic number.

61511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511 is an equidigital number, since it uses as much as digits as its factorization.

61511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30, while the sum is 14.

The square root of 61511 is about 248.0141125017. The cubic root of 61511 is about 39.4745870827.

It can be divided in two parts, 615 and 11, that added together give a palindrome (626).

The spelling of 61511 in words is "sixty-one thousand, five hundred eleven".