123131145 has 16 divisors (see below), whose sum is σ = 201592512. Its totient is φ = 64142400.

The previous prime is 123131143. The next prime is 123131147. The reversal of 123131145 is 541131321.

It is an interprime number because it is at equal distance from previous prime (123131143) and next prime (123131147).

It is not a de Polignac number, because 123131145 - 2¹ = 123131143 is a prime.

It is a super-2 number, since 2×123131145² = 30322557738022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123131143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94806 + ... + 96095.

It is an arithmetic number, because the mean of its divisors is an integer number (12599532).

Almost surely, 2^123131145 is an apocalyptic number.

123131145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123131145 is a deficient number, since it is larger than the sum of its proper divisors (78461367).

123131145 is a wasteful number, since it uses less digits than its factorization.

123131145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190952.

The product of its digits is 360, while the sum is 21.

The square root of 123131145 is about 11096.4474044624. The cubic root of 123131145 is about 497.4956709471.

Adding to 123131145 its reverse (541131321), we get a palindrome (664262466).

The spelling of 123131145 in words is "one hundred twenty-three million, one hundred thirty-one thousand, one hundred forty-five".