1211199953 has 2 divisors, whose sum is σ = 1211199954. Its totient is φ = 1211199952.

The previous prime is 1211199947. The next prime is 1211199971. The reversal of 1211199953 is 3599911121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628605184 + 582594769 = 25072^2 + 24137^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211199953 - 2¹² = 1211195857 is a prime.

It is a super-2 number, since 2×1211199953² = 2934010652294404418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211199953.

It is not a weakly prime, because it can be changed into another prime (1211199943) 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 as a sum of consecutive naturals, namely, 605599976 + 605599977.

It is an arithmetic number, because the mean of its divisors is an integer number (605599977).

Almost surely, 2^1211199953 is an apocalyptic number.

It is an amenable number.

1211199953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211199953 is an equidigital number, since it uses as much as digits as its factorization.

1211199953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 41.

The square root of 1211199953 is about 34802.2980994072. The cubic root of 1211199953 is about 1065.9543717937.

It can be divided in two parts, 121119 and 9953, that added together give a 17-th power (131072 = 2¹⁷).

The spelling of 1211199953 in words is "one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred fifty-three".