61409111 has 4 divisors (see below), whose sum is σ = 62017224. Its totient is φ = 60801000.

The previous prime is 61409093. The next prime is 61409113. The reversal of 61409111 is 11190416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61409111 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 (61409113) 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, 303905 + ... + 304106.

It is an arithmetic number, because the mean of its divisors is an integer number (15504306).

Almost surely, 2^61409111 is an apocalyptic number.

61409111 is a deficient number, since it is larger than the sum of its proper divisors (608113).

61409111 is a wasteful number, since it uses less digits than its factorization.

61409111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608112.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 61409111 is about 7836.3965570918. The cubic root of 61409111 is about 394.5277933559.

Adding to 61409111 its reverse (11190416), we get a palindrome (72599527).

It can be divided in two parts, 6140 and 9111, that added together give a palindrome (15251).

The spelling of 61409111 in words is "sixty-one million, four hundred nine thousand, one hundred eleven".