61256559 has 64 divisors (see below), whose sum is σ = 108573696. Its totient is φ = 29804544.

The previous prime is 61256519. The next prime is 61256561. The reversal of 61256559 is 95565216.

It is not a de Polignac number, because 61256559 - 2⁷ = 61256431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61256519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 310849 + ... + 311045.

It is an arithmetic number, because the mean of its divisors is an integer number (1696464).

Almost surely, 2^61256559 is an apocalyptic number.

61256559 is a deficient number, since it is larger than the sum of its proper divisors (47317137).

61256559 is a wasteful number, since it uses less digits than its factorization.

61256559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 81000, while the sum is 39.

The square root of 61256559 is about 7826.6569491706. The cubic root of 61256559 is about 394.2008282432.

The spelling of 61256559 in words is "sixty-one million, two hundred fifty-six thousand, five hundred fifty-nine".