61001550 has 36 divisors (see below), whose sum is σ = 163892040. Its totient is φ = 16266960.

The previous prime is 61001531. The next prime is 61001573. The reversal of 61001550 is 5510016.

61001550 is a `hidden beast` number, since 610 + 0 + 1 + 5 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67330 + ... + 68229.

Almost surely, 2^61001550 is an apocalyptic number.

61001550 is an abundant number, since it is smaller than the sum of its proper divisors (102890490).

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

61001550 is a wasteful number, since it uses less digits than its factorization.

61001550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135577 (or 135569 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 61001550 is about 7810.3489038583. The cubic root of 61001550 is about 393.6530524736.

Adding to 61001550 its reverse (5510016), we get a palindrome (66511566).

The spelling of 61001550 in words is "sixty-one million, one thousand, five hundred fifty".