1011215161 has 4 divisors (see below), whose sum is σ = 1103143824. Its totient is φ = 919286500.

The previous prime is 1011215141. The next prime is 1011215189. The reversal of 1011215161 is 1615121101.

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 1011215161 - 2⁹ = 1011214649 is a prime.

It is a super-2 number, since 2×1011215161² = 2045112203672511842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011215141) 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, 45964315 + ... + 45964336.

It is an arithmetic number, because the mean of its divisors is an integer number (275785956).

Almost surely, 2^1011215161 is an apocalyptic number.

1011215161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011215161 is a deficient number, since it is larger than the sum of its proper divisors (91928663).

1011215161 is an equidigital number, since it uses as much as digits as its factorization.

1011215161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91928662.

The product of its (nonzero) digits is 60, while the sum is 19.

The square root of 1011215161 is about 31799.6094472872. The cubic root of 1011215161 is about 1003.7244978935.

Adding to 1011215161 its reverse (1615121101), we get a palindrome (2626336262).

The spelling of 1011215161 in words is "one billion, eleven million, two hundred fifteen thousand, one hundred sixty-one".