151231320 has 128 divisors (see below), whose sum is σ = 533822400. Its totient is φ = 37951488.

The previous prime is 151231309. The next prime is 151231331. The reversal of 151231320 is 23132151.

It is an interprime number because it is at equal distance from previous prime (151231309) and next prime (151231331).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 151231293 and 151231302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14242 + ... + 22478.

Almost surely, 2^151231320 is an apocalyptic number.

151231320 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 151231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266911200).

151231320 is an abundant number, since it is smaller than the sum of its proper divisors (382591080).

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

151231320 is a wasteful number, since it uses less digits than its factorization.

151231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8274 (or 8264 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 151231320 is about 12297.6144028019. The cubic root of 151231320 is about 532.7791831003.

Adding to 151231320 its reverse (23132151), we get a palindrome (174363471).

The spelling of 151231320 in words is "one hundred fifty-one million, two hundred thirty-one thousand, three hundred twenty".