61554621 has 8 divisors (see below), whose sum is σ = 82663840. Its totient is φ = 40740912.

The previous prime is 61554613. The next prime is 61554707. The reversal of 61554621 is 12645516.

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

It is not a de Polignac number, because 61554621 - 2³ = 61554613 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 (61554121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73390 + ... + 74223.

It is an arithmetic number, because the mean of its divisors is an integer number (10332980).

Almost surely, 2^61554621 is an apocalyptic number.

It is an amenable number.

61554621 is a deficient number, since it is larger than the sum of its proper divisors (21109219).

61554621 is a wasteful number, since it uses less digits than its factorization.

61554621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147755.

The product of its digits is 7200, while the sum is 30.

The square root of 61554621 is about 7845.6753055425. The cubic root of 61554621 is about 394.8391611371.

The spelling of 61554621 in words is "sixty-one million, five hundred fifty-four thousand, six hundred twenty-one".