1221519953 has 2 divisors, whose sum is σ = 1221519954. Its totient is φ = 1221519952.

The previous prime is 1221519931. The next prime is 1221519977. The reversal of 1221519953 is 3599151221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217451664 + 4068289 = 34892^2 + 2017^2 .

It is an emirp because it is prime and its reverse (3599151221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221519953 - 2⁶ = 1221519889 is a prime.

It is a super-2 number, since 2×1221519953² = 2984221991154244418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221519913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610759976 + 610759977.

It is an arithmetic number, because the mean of its divisors is an integer number (610759977).

Almost surely, 2^1221519953 is an apocalyptic number.

It is an amenable number.

1221519953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221519953 is an equidigital number, since it uses as much as digits as its factorization.

1221519953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 38.

The square root of 1221519953 is about 34950.2496843728. The cubic root of 1221519953 is about 1068.9732932528.

The spelling of 1221519953 in words is "one billion, two hundred twenty-one million, five hundred nineteen thousand, nine hundred fifty-three".