1220938161 has 8 divisors (see below), whose sum is σ = 1628781504. Its totient is φ = 813526800.

The previous prime is 1220938151. The next prime is 1220938171. The reversal of 1220938161 is 1618390221.

It is an interprime number because it is at equal distance from previous prime (1220938151) and next prime (1220938171).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220938161 - 2¹⁷ = 1220807089 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220938151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101341 + ... + 112746.

It is an arithmetic number, because the mean of its divisors is an integer number (203597688).

Almost surely, 2^1220938161 is an apocalyptic number.

It is an amenable number.

1220938161 is a deficient number, since it is larger than the sum of its proper divisors (407843343).

1220938161 is a wasteful number, since it uses less digits than its factorization.

1220938161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215991.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1220938161 is about 34941.9255479717. The cubic root of 1220938161 is about 1068.8035542125.

The spelling of 1220938161 in words is "one billion, two hundred twenty million, nine hundred thirty-eight thousand, one hundred sixty-one".