61539550 has 12 divisors (see below), whose sum is σ = 114463656. Its totient is φ = 24615800.

The previous prime is 61539539. The next prime is 61539553. The reversal of 61539550 is 5593516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 615346 + ... + 615445.

It is an arithmetic number, because the mean of its divisors is an integer number (9538638).

Almost surely, 2^61539550 is an apocalyptic number.

61539550 is a deficient number, since it is larger than the sum of its proper divisors (52924106).

61539550 is a wasteful number, since it uses less digits than its factorization.

61539550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230803 (or 1230798 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 61539550 is about 7844.7147813034. The cubic root of 61539550 is about 394.8069344382.

The spelling of 61539550 in words is "sixty-one million, five hundred thirty-nine thousand, five hundred fifty".