1221046531 has 8 divisors (see below), whose sum is σ = 1230310080. Its totient is φ = 1211810472.

The previous prime is 1221046523. The next prime is 1221046553. The reversal of 1221046531 is 1356401221.

It is a happy number.

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 1221046531 - 2³ = 1221046523 is a prime.

It is a super-2 number, since 2×1221046531² = 2981909261734267922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221046496 and 1221046505.

It is not an unprimeable number, because it can be changed into a prime (1221046501) 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, 87096 + ... + 100138.

It is an arithmetic number, because the mean of its divisors is an integer number (153788760).

Almost surely, 2^1221046531 is an apocalyptic number.

1221046531 is a deficient number, since it is larger than the sum of its proper divisors (9263549).

1221046531 is a wasteful number, since it uses less digits than its factorization.

1221046531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13745.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1221046531 is about 34943.4762294767. The cubic root of 1221046531 is about 1068.8351754740.

Adding to 1221046531 its reverse (1356401221), we get a palindrome (2577447752).

The spelling of 1221046531 in words is "one billion, two hundred twenty-one million, forty-six thousand, five hundred thirty-one".