61321550 has 48 divisors (see below), whose sum is σ = 127157040. Its totient is φ = 21864960.

The previous prime is 61321541. The next prime is 61321613. The reversal of 61321550 is 5512316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14252 + ... + 18048.

It is an arithmetic number, because the mean of its divisors is an integer number (2649105).

Almost surely, 2^61321550 is an apocalyptic number.

61321550 is an abundant number, since it is smaller than the sum of its proper divisors (65835490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61321550 is a wasteful number, since it uses less digits than its factorization.

61321550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 61321550 is about 7830.8077488852. The cubic root of 61321550 is about 394.3401899232.

Adding to 61321550 its reverse (5512316), we get a palindrome (66833866).

The spelling of 61321550 in words is "sixty-one million, three hundred twenty-one thousand, five hundred fifty".