1221760167 has 4 divisors (see below), whose sum is σ = 1629013560. Its totient is φ = 814506776.

The previous prime is 1221760157. The next prime is 1221760171. The reversal of 1221760167 is 7610671221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221760167 - 2⁴ = 1221760151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221760157) 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, 203626692 + ... + 203626697.

It is an arithmetic number, because the mean of its divisors is an integer number (407253390).

Almost surely, 2^1221760167 is an apocalyptic number.

1221760167 is a deficient number, since it is larger than the sum of its proper divisors (407253393).

1221760167 is an equidigital number, since it uses as much as digits as its factorization.

1221760167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407253392.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 1221760167 is about 34953.6860288010. The cubic root of 1221760167 is about 1069.0433604724.

The spelling of 1221760167 in words is "one billion, two hundred twenty-one million, seven hundred sixty thousand, one hundred sixty-seven".