61554517 has 4 divisors (see below), whose sum is σ = 61570636. Its totient is φ = 61538400.

The previous prime is 61554497. The next prime is 61554529. The reversal of 61554517 is 71545516.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 53494596 + 8059921 = 7314^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 61554517 - 2²³ = 53165909 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 (61554557) 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 3 ways as a sum of consecutive naturals, for example, 1267 + ... + 11167.

It is an arithmetic number, because the mean of its divisors is an integer number (15392659).

Almost surely, 2^61554517 is an apocalyptic number.

It is an amenable number.

61554517 is a deficient number, since it is larger than the sum of its proper divisors (16119).

61554517 is an equidigital number, since it uses as much as digits as its factorization.

61554517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16118.

The product of its digits is 21000, while the sum is 34.

The square root of 61554517 is about 7845.6686776845. The cubic root of 61554517 is about 394.8389387693.

Subtracting 61554517 from its reverse (71545516), we obtain a palindrome (9990999).

The spelling of 61554517 in words is "sixty-one million, five hundred fifty-four thousand, five hundred seventeen".