1214207861 has 4 divisors (see below), whose sum is σ = 1214295852. Its totient is φ = 1214119872.

The previous prime is 1214207851. The next prime is 1214207893. The reversal of 1214207861 is 1687024121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 439698961 + 774508900 = 20969^2 + 27830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214207861 - 2²² = 1210013557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1214207831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18290 + ... + 52563.

It is an arithmetic number, because the mean of its divisors is an integer number (303573963).

Almost surely, 2^1214207861 is an apocalyptic number.

It is an amenable number.

1214207861 is a deficient number, since it is larger than the sum of its proper divisors (87991).

1214207861 is an equidigital number, since it uses as much as digits as its factorization.

1214207861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87990.

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

The square root of 1214207861 is about 34845.4855182131. The cubic root of 1214207861 is about 1066.8360434916.

The spelling of 1214207861 in words is "one billion, two hundred fourteen million, two hundred seven thousand, eight hundred sixty-one".