1206740161 has 4 divisors (see below), whose sum is σ = 1316443824. Its totient is φ = 1097036500.

The previous prime is 1206740137. The next prime is 1206740209. The reversal of 1206740161 is 1610476021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1206740161 - 2¹³ = 1206731969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206746161) 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, 54851815 + ... + 54851836.

It is an arithmetic number, because the mean of its divisors is an integer number (329110956).

Almost surely, 2^1206740161 is an apocalyptic number.

1206740161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1206740161 is a deficient number, since it is larger than the sum of its proper divisors (109703663).

1206740161 is a wasteful number, since it uses less digits than its factorization.

1206740161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109703662.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1206740161 is about 34738.1657690788. The cubic root of 1206740161 is about 1064.6444362495.

The spelling of 1206740161 in words is "one billion, two hundred six million, seven hundred forty thousand, one hundred sixty-one".