61121261 has 8 divisors (see below), whose sum is σ = 61998048. Its totient is φ = 60250000.

The previous prime is 61121209. The next prime is 61121279. The reversal of 61121261 is 16212116.

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

It is a cyclic number.

It is not a de Polignac number, because 61121261 - 2²² = 56926957 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 (61121861) 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, 24146 + ... + 26556.

It is an arithmetic number, because the mean of its divisors is an integer number (7749756).

Almost surely, 2^61121261 is an apocalyptic number.

It is an amenable number.

61121261 is a deficient number, since it is larger than the sum of its proper divisors (876787).

61121261 is a wasteful number, since it uses less digits than its factorization.

61121261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763.

The product of its digits is 144, while the sum is 20.

The square root of 61121261 is about 7818.0087618268. The cubic root of 61121261 is about 393.9103891476.

Adding to 61121261 its reverse (16212116), we get a palindrome (77333377).

The spelling of 61121261 in words is "sixty-one million, one hundred twenty-one thousand, two hundred sixty-one".