131228774 has 4 divisors (see below), whose sum is σ = 196843164. Its totient is φ = 65614386.

The previous prime is 131228771. The next prime is 131228791. The reversal of 131228774 is 477822131.

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

It is a super-2 number, since 2×131228774² = 34441982251086152, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131228771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32807192 + ... + 32807195.

It is an arithmetic number, because the mean of its divisors is an integer number (49210791).

Almost surely, 2^131228774 is an apocalyptic number.

131228774 is a deficient number, since it is larger than the sum of its proper divisors (65614390).

131228774 is an equidigital number, since it uses as much as digits as its factorization.

131228774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65614389.

The product of its digits is 18816, while the sum is 35.

The square root of 131228774 is about 11455.5128213450. The cubic root of 131228774 is about 508.1707813380.

The spelling of 131228774 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, seven hundred seventy-four".