61561501 has 16 divisors (see below), whose sum is σ = 68083200. Its totient is φ = 55403568.

The previous prime is 61561483. The next prime is 61561529. The reversal of 61561501 is 10516516.

It is a cyclic number.

It is not a de Polignac number, because 61561501 - 2⁷ = 61561373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77830 + ... + 78616.

It is an arithmetic number, because the mean of its divisors is an integer number (4255200).

Almost surely, 2^61561501 is an apocalyptic number.

It is an amenable number.

61561501 is a deficient number, since it is larger than the sum of its proper divisors (6521699).

61561501 is a wasteful number, since it uses less digits than its factorization.

61561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61561501 is about 7846.1137514059. The cubic root of 61561501 is about 394.8538710656.

The spelling of 61561501 in words is "sixty-one million, five hundred sixty-one thousand, five hundred one".