61554381 has 8 divisors (see below), whose sum is σ = 93797184. Its totient is φ = 35173920.

The previous prime is 61554293. The next prime is 61554401. The reversal of 61554381 is 18345516.

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

It is not a de Polignac number, because 61554381 - 2¹¹ = 61552333 is a prime.

It is a super-2 number, since 2×61554381² = 7577883640586322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61554781) 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 7 ways as a sum of consecutive naturals, for example, 1465560 + ... + 1465601.

It is an arithmetic number, because the mean of its divisors is an integer number (11724648).

Almost surely, 2^61554381 is an apocalyptic number.

It is an amenable number.

61554381 is a deficient number, since it is larger than the sum of its proper divisors (32242803).

61554381 is a wasteful number, since it uses less digits than its factorization.

61554381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931171.

The product of its digits is 14400, while the sum is 33.

The square root of 61554381 is about 7845.6600104771. The cubic root of 61554381 is about 394.8386479802.

Adding to 61554381 its reverse (18345516), we get a palindrome (79899897).

The spelling of 61554381 in words is "sixty-one million, five hundred fifty-four thousand, three hundred eighty-one".