131278045 has 4 divisors (see below), whose sum is σ = 157533660. Its totient is φ = 105022432.

The previous prime is 131278019. The next prime is 131278051. The reversal of 131278045 is 540872131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540872131 = 7759 ⋅69709.

It can be written as a sum of positive squares in 2 ways, for example, as 100741369 + 30536676 = 10037^2 + 5526^2 .

It is a cyclic number.

It is not a de Polignac number, because 131278045 - 2¹⁵ = 131245277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131277998 and 131278016.

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, 13127800 + ... + 13127809.

It is an arithmetic number, because the mean of its divisors is an integer number (39383415).

Almost surely, 2^131278045 is an apocalyptic number.

It is an amenable number.

131278045 is a deficient number, since it is larger than the sum of its proper divisors (26255615).

131278045 is an equidigital number, since it uses as much as digits as its factorization.

131278045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26255614.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 131278045 is about 11457.6631561589. The cubic root of 131278045 is about 508.2343724465.

The spelling of 131278045 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, forty-five".