1213101281 has 6 divisors (see below), whose sum is σ = 1411158690. Its totient is φ = 1039801056.

The previous prime is 1213101271. The next prime is 1213101287. The reversal of 1213101281 is 1821013121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 903904225 + 309197056 = 30065^2 + 17584^2 .

It is not a de Polignac number, because 1213101281 - 2¹⁰ = 1213100257 is a prime.

It is a super-2 number, since 2×1213101281² = 2943229435927681922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213101287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12378536 + ... + 12378633.

It is an arithmetic number, because the mean of its divisors is an integer number (235193115).

Almost surely, 2^1213101281 is an apocalyptic number.

It is an amenable number.

1213101281 is a deficient number, since it is larger than the sum of its proper divisors (198057409).

1213101281 is an equidigital number, since it uses as much as digits as its factorization.

1213101281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24757183 (or 24757176 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1213101281 is about 34829.6035148263. The cubic root of 1213101281 is about 1066.5118545613.

The spelling of 1213101281 in words is "one billion, two hundred thirteen million, one hundred one thousand, two hundred eighty-one".