1212146381 has 8 divisors (see below), whose sum is σ = 1256332440. Its totient is φ = 1168561728.

The previous prime is 1212146371. The next prime is 1212146387. The reversal of 1212146381 is 1836412121.

It can be written as a sum of positive squares in 4 ways, for example, as 525968356 + 686178025 = 22934^2 + 26195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212146381 - 2¹⁰ = 1212145357 is a prime.

It is a super-2 number, since 2×1212146381² = 2938597697942794322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212146387) 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 7 ways as a sum of consecutive naturals, for example, 146246 + ... + 154311.

It is an arithmetic number, because the mean of its divisors is an integer number (157041555).

Almost surely, 2^1212146381 is an apocalyptic number.

It is an amenable number.

1212146381 is a deficient number, since it is larger than the sum of its proper divisors (44186059).

1212146381 is a wasteful number, since it uses less digits than its factorization.

1212146381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300703.

The product of its digits is 2304, while the sum is 29.

The square root of 1212146381 is about 34815.8926497656. The cubic root of 1212146381 is about 1066.2319440215.

The spelling of 1212146381 in words is "one billion, two hundred twelve million, one hundred forty-six thousand, three hundred eighty-one".