61001564 has 18 divisors (see below), whose sum is σ = 115597440. Its totient is φ = 28154256.

The previous prime is 61001531. The next prime is 61001573. The reversal of 61001564 is 46510016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44444 + ... + 45795.

It is an arithmetic number, because the mean of its divisors is an integer number (6422080).

Almost surely, 2^61001564 is an apocalyptic number.

It is an amenable number.

61001564 is a deficient number, since it is larger than the sum of its proper divisors (54595876).

61001564 is a wasteful number, since it uses less digits than its factorization.

61001564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90269 (or 90254 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61001564 is about 7810.3498001050. The cubic root of 61001564 is about 393.6530825883.

The spelling of 61001564 in words is "sixty-one million, one thousand, five hundred sixty-four".