1321023531 has 8 divisors (see below), whose sum is σ = 1764221904. Its totient is φ = 879253760.

The previous prime is 1321023527. The next prime is 1321023547. The reversal of 1321023531 is 1353201231.

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 1321023531 - 2² = 1321023527 is a prime.

It is a super-2 number, since 2×1321023531² = 3490206338911415922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321023498 and 1321023507.

It is not an unprimeable number, because it can be changed into a prime (1321023521) 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, 354990 + ... + 358691.

It is an arithmetic number, because the mean of its divisors is an integer number (220527738).

Almost surely, 2^1321023531 is an apocalyptic number.

1321023531 is a deficient number, since it is larger than the sum of its proper divisors (443198373).

1321023531 is an equidigital number, since it uses as much as digits as its factorization.

1321023531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714301.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1321023531 is about 36345.8874014654. The cubic root of 1321023531 is about 1097.2447659995.

Adding to 1321023531 its reverse (1353201231), we get a palindrome (2674224762).

The spelling of 1321023531 in words is "one billion, three hundred twenty-one million, twenty-three thousand, five hundred thirty-one".