1431155220 has 192 divisors, whose sum is σ = 4720343040. Its totient is φ = 320320000.

The previous prime is 1431155177. The next prime is 1431155263. The reversal of 1431155220 is 225511341.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1431155177) and next prime (1431155263).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 438595 + ... + 441845.

It is an arithmetic number, because the mean of its divisors is an integer number (24585120).

Almost surely, 2^1431155220 is an apocalyptic number.

1431155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1431155220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2360171520).

1431155220 is an abundant number, since it is smaller than the sum of its proper divisors (3289187820).

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

1431155220 is a wasteful number, since it uses less digits than its factorization.

1431155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326 (or 3324 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1431155220 is about 37830.6122075760. The cubic root of 1431155220 is about 1126.9264690752.

Adding to 1431155220 its reverse (225511341), we get a palindrome (1656666561).

It can be divided in two parts, 1431 and 155220, that added together give a palindrome (156651).

The spelling of 1431155220 in words is "one billion, four hundred thirty-one million, one hundred fifty-five thousand, two hundred twenty".