61409181 has 4 divisors (see below), whose sum is σ = 81878912. Its totient is φ = 40939452.

The previous prime is 61409177. The next prime is 61409189. The reversal of 61409181 is 18190416.

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 not a de Polignac number, because 61409181 - 2² = 61409177 is a prime.

It is a super-2 number, since 2×61409181² = 7542175022181522, 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 (61409189) 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, 10234861 + ... + 10234866.

It is an arithmetic number, because the mean of its divisors is an integer number (20469728).

Almost surely, 2^61409181 is an apocalyptic number.

It is an amenable number.

61409181 is a deficient number, since it is larger than the sum of its proper divisors (20469731).

61409181 is a wasteful number, since it uses less digits than its factorization.

61409181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20469730.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 61409181 is about 7836.4010234291. The cubic root of 61409181 is about 394.5279432627.

Adding to 61409181 its reverse (18190416), we get a palindrome (79599597).

The spelling of 61409181 in words is "sixty-one million, four hundred nine thousand, one hundred eighty-one".