131222028 has 48 divisors (see below), whose sum is σ = 353412864. Its totient is φ = 37118400.

The previous prime is 131222027. The next prime is 131222029. The reversal of 131222028 is 820222131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131222027) and next prime (131222029).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 131221995 and 131222013.

It is not an unprimeable number, because it can be changed into a prime (131222023) 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, 751 + ... + 16217.

It is an arithmetic number, because the mean of its divisors is an integer number (7362768).

Almost surely, 2^131222028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131222028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176706432).

131222028 is an abundant number, since it is smaller than the sum of its proper divisors (222190836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131222028 is a wasteful number, since it uses less digits than its factorization.

131222028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15582 (or 15580 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 131222028 is about 11455.2183741734. The cubic root of 131222028 is about 508.1620734438.

Adding to 131222028 its reverse (820222131), we get a palindrome (951444159).

The spelling of 131222028 in words is "one hundred thirty-one million, two hundred twenty-two thousand, twenty-eight".