151231440 has 80 divisors (see below), whose sum is σ = 489218688. Its totient is φ = 38573568.

The previous prime is 151231429. The next prime is 151231447. The reversal of 151231440 is 44132151.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151231447) 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, 8179 + ... + 19218.

Almost surely, 2^151231440 is an apocalyptic number.

151231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

151231440 is an abundant number, since it is smaller than the sum of its proper divisors (337987248).

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

151231440 is a wasteful number, since it uses less digits than its factorization.

151231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27436 (or 27430 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 151231440 is about 12297.6192817960. The cubic root of 151231440 is about 532.7793240180.

Adding to 151231440 its reverse (44132151), we get a palindrome (195363591).

The spelling of 151231440 in words is "one hundred fifty-one million, two hundred thirty-one thousand, four hundred forty".