1161215157 has 4 divisors (see below), whose sum is σ = 1548286880. Its totient is φ = 774143436.

The previous prime is 1161215149. The next prime is 1161215171. The reversal of 1161215157 is 7515121611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1161215157 - 2³ = 1161215149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161215117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193535857 + ... + 193535862.

It is an arithmetic number, because the mean of its divisors is an integer number (387071720).

Almost surely, 2^1161215157 is an apocalyptic number.

It is an amenable number.

1161215157 is a deficient number, since it is larger than the sum of its proper divisors (387071723).

1161215157 is an equidigital number, since it uses as much as digits as its factorization.

1161215157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387071722.

The product of its digits is 2100, while the sum is 30.

The square root of 1161215157 is about 34076.6071814669. The cubic root of 1161215157 is about 1051.0843392235.

Adding to 1161215157 its reverse (7515121611), we get a palindrome (8676336768).

It can be divided in two parts, 116121 and 5157, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 1161215157 in words is "one billion, one hundred sixty-one million, two hundred fifteen thousand, one hundred fifty-seven".