231351145 has 4 divisors (see below), whose sum is σ = 277621380. Its totient is φ = 185080912.

The previous prime is 231351119. The next prime is 231351149. The reversal of 231351145 is 541153132.

It is a happy number.

231351145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 183575401 + 47775744 = 13549^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 231351145 - 2⁷ = 231351017 is a prime.

It is a super-2 number, since 2×231351145² = 107046704585622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231351149) 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, 23135110 + ... + 23135119.

It is an arithmetic number, because the mean of its divisors is an integer number (69405345).

Almost surely, 2^231351145 is an apocalyptic number.

It is an amenable number.

231351145 is a deficient number, since it is larger than the sum of its proper divisors (46270235).

231351145 is an equidigital number, since it uses as much as digits as its factorization.

231351145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46270234.

The product of its digits is 1800, while the sum is 25.

The square root of 231351145 is about 15210.2315892954. The cubic root of 231351145 is about 613.8899888492.

The spelling of 231351145 in words is "two hundred thirty-one million, three hundred fifty-one thousand, one hundred forty-five".