1087197121 has 4 divisors (see below), whose sum is σ = 1088472532. Its totient is φ = 1085921712.

The previous prime is 1087197113. The next prime is 1087197127. The reversal of 1087197121 is 1217917801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1217917801 = 31 ⋅39287671.

It can be written as a sum of positive squares in 2 ways, for example, as 215766721 + 871430400 = 14689^2 + 29520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087197121 - 2³ = 1087197113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087197127) 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, 636426 + ... + 638131.

It is an arithmetic number, because the mean of its divisors is an integer number (272118133).

Almost surely, 2^1087197121 is an apocalyptic number.

It is an amenable number.

1087197121 is a deficient number, since it is larger than the sum of its proper divisors (1275411).

1087197121 is an equidigital number, since it uses as much as digits as its factorization.

1087197121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275410.

The product of its (nonzero) digits is 7056, while the sum is 37.

The square root of 1087197121 is about 32972.6723363454. The cubic root of 1087197121 is about 1028.2595803799.

The spelling of 1087197121 in words is "one billion, eighty-seven million, one hundred ninety-seven thousand, one hundred twenty-one".