131233645 has 4 divisors (see below), whose sum is σ = 157480380. Its totient is φ = 104986912.

The previous prime is 131233621. The next prime is 131233673. The reversal of 131233645 is 546332131.

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 104162436 + 27071209 = 10206^2 + 5203^2 .

It is a cyclic number.

It is not a de Polignac number, because 131233645 - 2⁷ = 131233517 is a prime.

It is a super-3 number, since 3×131233645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

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, 13123360 + ... + 13123369.

It is an arithmetic number, because the mean of its divisors is an integer number (39370095).

Almost surely, 2^131233645 is an apocalyptic number.

It is an amenable number.

131233645 is a deficient number, since it is larger than the sum of its proper divisors (26246735).

131233645 is an equidigital number, since it uses as much as digits as its factorization.

131233645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26246734.

The product of its digits is 6480, while the sum is 28.

The square root of 131233645 is about 11455.7254244330. The cubic root of 131233645 is about 508.1770687529.

Adding to 131233645 its reverse (546332131), we get a palindrome (677565776).

The spelling of 131233645 in words is "one hundred thirty-one million, two hundred thirty-three thousand, six hundred forty-five".