61423581 has 8 divisors (see below), whose sum is σ = 82420384. Its totient is φ = 40687920.

The previous prime is 61423573. The next prime is 61423597. The reversal of 61423581 is 18532416.

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

It is not a de Polignac number, because 61423581 - 2³ = 61423573 is a prime.

It is a super-2 number, since 2×61423581² = 7545712605727122, 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 (61423541) 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, 64735 + ... + 65676.

It is an arithmetic number, because the mean of its divisors is an integer number (10302548).

Almost surely, 2^61423581 is an apocalyptic number.

It is an amenable number.

61423581 is a deficient number, since it is larger than the sum of its proper divisors (20996803).

61423581 is a wasteful number, since it uses less digits than its factorization.

61423581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130571.

The product of its digits is 5760, while the sum is 30.

The square root of 61423581 is about 7837.3197586930. The cubic root of 61423581 is about 394.5587788168.

Adding to 61423581 its reverse (18532416), we get a palindrome (79955997).

The spelling of 61423581 in words is "sixty-one million, four hundred twenty-three thousand, five hundred eighty-one".