61411581 has 64 divisors (see below), whose sum is σ = 114892800. Its totient is φ = 31492800.

The previous prime is 61411561. The next prime is 61411631. The reversal of 61411581 is 18511416.

It is not a de Polignac number, because 61411581 - 2⁶ = 61411517 is a prime.

It is a super-2 number, since 2×61411581² = 7542764561839122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61411501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 226476 + ... + 226746.

It is an arithmetic number, because the mean of its divisors is an integer number (1795200).

Almost surely, 2^61411581 is an apocalyptic number.

It is an amenable number.

61411581 is a deficient number, since it is larger than the sum of its proper divisors (53481219).

61411581 is a wasteful number, since it uses less digits than its factorization.

61411581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 401 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 61411581 is about 7836.5541534529. The cubic root of 61411581 is about 394.5330828564.

Adding to 61411581 its reverse (18511416), we get a palindrome (79922997).

The spelling of 61411581 in words is "sixty-one million, four hundred eleven thousand, five hundred eighty-one".