31220069 has 4 divisors (see below), whose sum is σ = 32227200. Its totient is φ = 30212940.

The previous prime is 31220053. The next prime is 31220081. The reversal of 31220069 is 96002213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96002213 = 17 ⋅5647189.

It is a cyclic number.

It is not a de Polignac number, because 31220069 - 2⁴ = 31220053 is a prime.

It is a super-2 number, since 2×31220069² = 1949385416729522, which contains 22 as substring.

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 (31420069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503519 + ... + 503580.

It is an arithmetic number, because the mean of its divisors is an integer number (8056800).

Almost surely, 2^31220069 is an apocalyptic number.

It is an amenable number.

31220069 is a deficient number, since it is larger than the sum of its proper divisors (1007131).

31220069 is a wasteful number, since it uses less digits than its factorization.

31220069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007130.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31220069 is about 5587.4921923883. The cubic root of 31220069 is about 314.8796684923.

The spelling of 31220069 in words is "thirty-one million, two hundred twenty thousand, sixty-nine".