1215151161 has 16 divisors (see below), whose sum is σ = 1859349888. Its totient is φ = 691488000.

The previous prime is 1215151159. The next prime is 1215151163. The reversal of 1215151161 is 1611515121.

1215151161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1215151159) and next prime (1215151163).

It is not a de Polignac number, because 1215151161 - 2¹ = 1215151159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215151163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114990 + ... + 125111.

It is an arithmetic number, because the mean of its divisors is an integer number (116209368).

Almost surely, 2^1215151161 is an apocalyptic number.

It is an amenable number.

1215151161 is a deficient number, since it is larger than the sum of its proper divisors (644198727).

1215151161 is a wasteful number, since it uses less digits than its factorization.

1215151161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240352.

The product of its digits is 300, while the sum is 24.

The square root of 1215151161 is about 34859.0183596727. The cubic root of 1215151161 is about 1067.1122416559.

Adding to 1215151161 its reverse (1611515121), we get a palindrome (2826666282).

The spelling of 1215151161 in words is "one billion, two hundred fifteen million, one hundred fifty-one thousand, one hundred sixty-one".