1212827161 has 16 divisors (see below), whose sum is σ = 1503621504. Its totient is φ = 952585344.

The previous prime is 1212827153. The next prime is 1212827173. The reversal of 1212827161 is 1617282121.

It is a cyclic number.

It is not a de Polignac number, because 1212827161 - 2³ = 1212827153 is a prime.

It is a super-3 number, since 3×1212827161³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212827261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36175 + ... + 61108.

It is an arithmetic number, because the mean of its divisors is an integer number (93976344).

Almost surely, 2^1212827161 is an apocalyptic number.

It is an amenable number.

1212827161 is a deficient number, since it is larger than the sum of its proper divisors (290794343).

1212827161 is a wasteful number, since it uses less digits than its factorization.

1212827161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97440.

The product of its digits is 2688, while the sum is 31.

The square root of 1212827161 is about 34825.6681342943. The cubic root of 1212827161 is about 1066.4315165996.

It can be divided in two parts, 121 and 2827161, that added together give a palindrome (2827282).

The spelling of 1212827161 in words is "one billion, two hundred twelve million, eight hundred twenty-seven thousand, one hundred sixty-one".