87461930561 has 4 divisors (see below), whose sum is σ = 87463722324. Its totient is φ = 87460138800.

The previous prime is 87461930537. The next prime is 87461930573. The reversal of 87461930561 is 16503916478.

87461930561 = 209119² + 209120².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43731174400 + 43730756161 = 209120^2 + 209119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87461930561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87461930461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820550 + ... + 920991.

It is an arithmetic number, because the mean of its divisors is an integer number (21865930581).

Almost surely, 2^87461930561 is an apocalyptic number.

87461930561 is the 209120-th centered square number.

It is an amenable number.

87461930561 is a deficient number, since it is larger than the sum of its proper divisors (1791763).

87461930561 is a wasteful number, since it uses less digits than its factorization.

87461930561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791762.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 87461930561 in words is "eighty-seven billion, four hundred sixty-one million, nine hundred thirty thousand, five hundred sixty-one".