1221253031 has 2 divisors, whose sum is σ = 1221253032. Its totient is φ = 1221253030.

The previous prime is 1221253009. The next prime is 1221253051. The reversal of 1221253031 is 1303521221.

It is an a-pointer prime, because the next prime (1221253051) can be obtained adding 1221253031 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221253031 - 2¹⁸ = 1220990887 is a prime.

It is a super-2 number, since 2×1221253031² = 2982917931453373922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221252994 and 1221253012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221253051) 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 as a sum of consecutive naturals, namely, 610626515 + 610626516.

It is an arithmetic number, because the mean of its divisors is an integer number (610626516).

Almost surely, 2^1221253031 is an apocalyptic number.

1221253031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221253031 is an equidigital number, since it uses as much as digits as its factorization.

1221253031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1221253031 is about 34946.4308764143. The cubic root of 1221253031 is about 1068.8954248904.

Adding to 1221253031 its reverse (1303521221), we get a palindrome (2524774252).

The spelling of 1221253031 in words is "one billion, two hundred twenty-one million, two hundred fifty-three thousand, thirty-one".