1531424021 has 8 divisors (see below), whose sum is σ = 1545852000. Its totient is φ = 1517045040.

The previous prime is 1531423991. The next prime is 1531424033. The reversal of 1531424021 is 1204241351.

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

It is a cyclic number.

It is not a de Polignac number, because 1531424021 - 2¹⁴ = 1531407637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531424051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52130 + ... + 76028.

It is an arithmetic number, because the mean of its divisors is an integer number (193231500).

Almost surely, 2^1531424021 is an apocalyptic number.

It is an amenable number.

1531424021 is a deficient number, since it is larger than the sum of its proper divisors (14427979).

1531424021 is a wasteful number, since it uses less digits than its factorization.

1531424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24499.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1531424021 is about 39133.4131018494. The cubic root of 1531424021 is about 1152.6527346387.

Adding to 1531424021 its reverse (1204241351), we get a palindrome (2735665372).

The spelling of 1531424021 in words is "one billion, five hundred thirty-one million, four hundred twenty-four thousand, twenty-one".