31220089 has 4 divisors (see below), whose sum is σ = 31615360. Its totient is φ = 30824820.

The previous prime is 31220083. The next prime is 31220093. The reversal of 31220089 is 98002213.

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: 98002213 = 1481 ⋅66173.

It is a cyclic number.

It is not a de Polignac number, because 31220089 - 2³ = 31220081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220081) 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, 197517 + ... + 197674.

It is an arithmetic number, because the mean of its divisors is an integer number (7903840).

Almost surely, 2^31220089 is an apocalyptic number.

It is an amenable number.

31220089 is a deficient number, since it is larger than the sum of its proper divisors (395271).

31220089 is an equidigital number, since it uses as much as digits as its factorization.

31220089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395270.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 31220089 is about 5587.4939820997. The cubic root of 31220089 is about 314.8797357310.

The spelling of 31220089 in words is "thirty-one million, two hundred twenty thousand, eighty-nine".