61621550 has 12 divisors (see below), whose sum is σ = 114616176. Its totient is φ = 24648600.

The previous prime is 61621517. The next prime is 61621589. The reversal of 61621550 is 5512616.

61621550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616166 + ... + 616265.

It is an arithmetic number, because the mean of its divisors is an integer number (9551348).

Almost surely, 2^61621550 is an apocalyptic number.

61621550 is a deficient number, since it is larger than the sum of its proper divisors (52994626).

61621550 is a wasteful number, since it uses less digits than its factorization.

61621550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232443 (or 1232438 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 61621550 is about 7849.9394902126. The cubic root of 61621550 is about 394.9822135878.

The spelling of 61621550 in words is "sixty-one million, six hundred twenty-one thousand, five hundred fifty".