151531421 has 8 divisors (see below), whose sum is σ = 162840960. Its totient is φ = 140488128.

The previous prime is 151531397. The next prime is 151531423. The reversal of 151531421 is 124135151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151531421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151531423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65381 + ... + 67658.

It is an arithmetic number, because the mean of its divisors is an integer number (20355120).

Almost surely, 2^151531421 is an apocalyptic number.

It is an amenable number.

151531421 is a deficient number, since it is larger than the sum of its proper divisors (11309539).

151531421 is a wasteful number, since it uses less digits than its factorization.

151531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133123.

The product of its digits is 600, while the sum is 23.

The square root of 151531421 is about 12309.8099497921. The cubic root of 151531421 is about 533.1313630646.

Adding to 151531421 its reverse (124135151), we get a palindrome (275666572).

The spelling of 151531421 in words is "one hundred fifty-one million, five hundred thirty-one thousand, four hundred twenty-one".