87075231250921 has 9 divisors (see below), whose sum is σ = 87224593243671. Its totient is φ = 86926124634552.

The previous prime is 87075231250913. The next prime is 87075231250939. The reversal of 87075231250921 is 12905213257078.

The square root of 87075231250921 is 9331411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1365333825625 + 85709897425296 = 1168475^2 + 9257964^2 .

It is not a de Polignac number, because 87075231250921 - 2³ = 87075231250913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87075231257921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5664158791 + ... + 5664174163.

It is an arithmetic number, because the mean of its divisors is an integer number (9691621471519).

Almost surely, 2^{87075231250921} is an apocalyptic number.

87075231250921 is the 9331411-st square number.

87075231250921 is the 4665706-th centered octagonal number.

It is an amenable number.

87075231250921 is a deficient number, since it is larger than the sum of its proper divisors (149361992750).

87075231250921 is an frugal number, since it uses more digits than its factorization.

87075231250921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31960 (or 15980 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 87075231250921 in words is "eighty-seven trillion, seventy-five billion, two hundred thirty-one million, two hundred fifty thousand, nine hundred twenty-one".