1428391531 has 8 divisors (see below), whose sum is σ = 1636346880. Its totient is φ = 1221411048.

The previous prime is 1428391513. The next prime is 1428391541. The reversal of 1428391531 is 1351938241.

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 1428391531 - 2²³ = 1420002923 is a prime.

It is a super-2 number, since 2×1428391531² = 4080604731665047922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1428391541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240571 + ... + 246436.

It is an arithmetic number, because the mean of its divisors is an integer number (204543360).

Almost surely, 2^1428391531 is an apocalyptic number.

1428391531 is a deficient number, since it is larger than the sum of its proper divisors (207955349).

1428391531 is an equidigital number, since it uses as much as digits as its factorization.

1428391531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487433.

The product of its digits is 25920, while the sum is 37.

The square root of 1428391531 is about 37794.0674048190. The cubic root of 1428391531 is about 1126.2006029654.

The spelling of 1428391531 in words is "one billion, four hundred twenty-eight million, three hundred ninety-one thousand, five hundred thirty-one".