1212872261 has 2 divisors, whose sum is σ = 1212872262. Its totient is φ = 1212872260.

The previous prime is 1212872207. The next prime is 1212872329. The reversal of 1212872261 is 1622782121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613552900 + 599319361 = 24770^2 + 24481^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212872261 - 2²² = 1208677957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212872561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606436130 + 606436131.

It is an arithmetic number, because the mean of its divisors is an integer number (606436131).

Almost surely, 2^1212872261 is an apocalyptic number.

It is an amenable number.

1212872261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212872261 is an equidigital number, since it uses as much as digits as its factorization.

1212872261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 1212872261 is about 34826.3156391830. The cubic root of 1212872261 is about 1066.4447351539. Note that the first 3 decimals are identical.

The spelling of 1212872261 in words is "one billion, two hundred twelve million, eight hundred seventy-two thousand, two hundred sixty-one".