1213955297 has 2 divisors, whose sum is σ = 1213955298. Its totient is φ = 1213955296.

The previous prime is 1213955287. The next prime is 1213955357. The reversal of 1213955297 is 7925593121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962922961 + 251032336 = 31031^2 + 15844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213955297 - 2⁶ = 1213955233 is a prime.

It is a super-2 number, since 2×1213955297² = 2947374926228716418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213955207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606977648 + 606977649.

It is an arithmetic number, because the mean of its divisors is an integer number (606977649).

Almost surely, 2^1213955297 is an apocalyptic number.

It is an amenable number.

1213955297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213955297 is an equidigital number, since it uses as much as digits as its factorization.

1213955297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 1213955297 is about 34841.8612734739. The cubic root of 1213955297 is about 1066.7620684962.

The spelling of 1213955297 in words is "one billion, two hundred thirteen million, nine hundred fifty-five thousand, two hundred ninety-seven".