1361667121 has 4 divisors (see below), whose sum is σ = 1362435172. Its totient is φ = 1360899072.

The previous prime is 1361667119. The next prime is 1361667169. The reversal of 1361667121 is 1217661631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 698862096 + 662805025 = 26436^2 + 25745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361667121 - 2¹ = 1361667119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361667101) 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, 381360 + ... + 384913.

It is an arithmetic number, because the mean of its divisors is an integer number (340608793).

Almost surely, 2^1361667121 is an apocalyptic number.

It is an amenable number.

1361667121 is a deficient number, since it is larger than the sum of its proper divisors (768051).

1361667121 is an equidigital number, since it uses as much as digits as its factorization.

1361667121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768050.

The product of its digits is 9072, while the sum is 34.

The square root of 1361667121 is about 36900.7739891726. The cubic root of 1361667121 is about 1108.3841763298.

The spelling of 1361667121 in words is "one billion, three hundred sixty-one million, six hundred sixty-seven thousand, one hundred twenty-one".