1221003131 has 2 divisors, whose sum is σ = 1221003132. Its totient is φ = 1221003130.

The previous prime is 1221003101. The next prime is 1221003149. The reversal of 1221003131 is 1313001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221003131 - 2¹⁴ = 1220986747 is a prime.

It is a super-2 number, since 2×1221003131² = 2981697291823606322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221003101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501565 + 610501566.

It is an arithmetic number, because the mean of its divisors is an integer number (610501566).

Almost surely, 2^1221003131 is an apocalyptic number.

1221003131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221003131 is an equidigital number, since it uses as much as digits as its factorization.

1221003131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221003131 is about 34942.8552210606. The cubic root of 1221003131 is about 1068.8225120210.

Adding to 1221003131 its reverse (1313001221), we get a palindrome (2534004352).

The spelling of 1221003131 in words is "one billion, two hundred twenty-one million, three thousand, one hundred thirty-one".