61909261 has 8 divisors (see below), whose sum is σ = 64978560. Its totient is φ = 58871472.

The previous prime is 61909249. The next prime is 61909279. The reversal of 61909261 is 16290916.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61909261 is a prime.

It is a super-2 number, since 2×61909261² = 7665513195132242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61909241) 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, 3801 + ... + 11758.

It is an arithmetic number, because the mean of its divisors is an integer number (8122320).

Almost surely, 2^61909261 is an apocalyptic number.

It is an amenable number.

61909261 is a deficient number, since it is larger than the sum of its proper divisors (3069299).

61909261 is a wasteful number, since it uses less digits than its factorization.

61909261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15755.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 61909261 is about 7868.2438320123. The cubic root of 61909261 is about 395.5959832953.

It can be divided in two parts, 6190 and 9261, that added together give a palindrome (15451).

The spelling of 61909261 in words is "sixty-one million, nine hundred nine thousand, two hundred sixty-one".