1161521027 has 4 divisors (see below), whose sum is σ = 1161935880. Its totient is φ = 1161106176.

The previous prime is 1161520993. The next prime is 1161521041. The reversal of 1161521027 is 7201251611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7201251611 = 19463 ⋅369997.

It is a cyclic number.

It is not a de Polignac number, because 1161521027 - 2¹⁸ = 1161258883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161520987 and 1161521005.

It is not an unprimeable number, because it can be changed into a prime (1161521227) 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, 203198 + ... + 208835.

It is an arithmetic number, because the mean of its divisors is an integer number (290483970).

Almost surely, 2^1161521027 is an apocalyptic number.

1161521027 is a deficient number, since it is larger than the sum of its proper divisors (414853).

1161521027 is an equidigital number, since it uses as much as digits as its factorization.

1161521027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414852.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1161521027 is about 34081.0948621079. The cubic root of 1161521027 is about 1051.1766181152.

Adding to 1161521027 its reverse (7201251611), we get a palindrome (8362772638).

The spelling of 1161521027 in words is "one billion, one hundred sixty-one million, five hundred twenty-one thousand, twenty-seven".