61551423 has 6 divisors (see below), whose sum is σ = 88907624. Its totient is φ = 41034276.

The previous prime is 61551419. The next prime is 61551437. The reversal of 61551423 is 32415516.

61551423 is a `hidden beast` number, since 615 + 5 + 1 + 42 + 3 = 666.

It is not a de Polignac number, because 61551423 - 2² = 61551419 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 (61551323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419515 + ... + 3419532.

Almost surely, 2^61551423 is an apocalyptic number.

61551423 is a deficient number, since it is larger than the sum of its proper divisors (27356201).

61551423 is a wasteful number, since it uses less digits than its factorization.

61551423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839053 (or 6839050 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 61551423 is about 7845.4714963474. The cubic root of 61551423 is about 394.8323232128.

Adding to 61551423 its reverse (32415516), we get a palindrome (93966939).

The spelling of 61551423 in words is "sixty-one million, five hundred fifty-one thousand, four hundred twenty-three".