23031145 has 4 divisors (see below), whose sum is σ = 27637380. Its totient is φ = 18424912.

The previous prime is 23031121. The next prime is 23031157. The reversal of 23031145 is 54113032.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 19616041 = 1848^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 23031145 - 2¹³ = 23022953 is a prime.

It is a super-2 number, since 2×23031145² = 1060867280022050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2303110 + ... + 2303119.

It is an arithmetic number, because the mean of its divisors is an integer number (6909345).

Almost surely, 2^23031145 is an apocalyptic number.

It is an amenable number.

23031145 is a deficient number, since it is larger than the sum of its proper divisors (4606235).

23031145 is an equidigital number, since it uses as much as digits as its factorization.

23031145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606234.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 23031145 is about 4799.0775155232. The cubic root of 23031145 is about 284.5150056485.

Adding to 23031145 its reverse (54113032), we get a palindrome (77144177).

It can be divided in two parts, 230 and 31145, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 23031145 in words is "twenty-three million, thirty-one thousand, one hundred forty-five".