61115261 has 4 divisors (see below), whose sum is σ = 61240224. Its totient is φ = 60990300.

The previous prime is 61115251. The next prime is 61115279. The reversal of 61115261 is 16251116.

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 a de Polignac number, because none of the positive numbers 2^k-61115261 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 (61115251) 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, 61745 + ... + 62726.

It is an arithmetic number, because the mean of its divisors is an integer number (15310056).

Almost surely, 2^61115261 is an apocalyptic number.

It is an amenable number.

61115261 is a deficient number, since it is larger than the sum of its proper divisors (124963).

61115261 is a wasteful number, since it uses less digits than its factorization.

61115261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124962.

The product of its digits is 360, while the sum is 23.

The square root of 61115261 is about 7817.6250229849. The cubic root of 61115261 is about 393.8974992538.

Adding to 61115261 its reverse (16251116), we get a palindrome (77366377).

The spelling of 61115261 in words is "sixty-one million, one hundred fifteen thousand, two hundred sixty-one".