1218997453 has 2 divisors, whose sum is σ = 1218997454. Its totient is φ = 1218997452.

The previous prime is 1218997391. The next prime is 1218997477. The reversal of 1218997453 is 3547998121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204228804 + 14768649 = 34702^2 + 3843^2 .

It is an emirp because it is prime and its reverse (3547998121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218997453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218997397 and 1218997406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218997253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609498726 + 609498727.

It is an arithmetic number, because the mean of its divisors is an integer number (609498727).

Almost surely, 2^1218997453 is an apocalyptic number.

It is an amenable number.

1218997453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218997453 is an equidigital number, since it uses as much as digits as its factorization.

1218997453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 1218997453 is about 34914.1440250223. The cubic root of 1218997453 is about 1068.2369583329.

The spelling of 1218997453 in words is "one billion, two hundred eighteen million, nine hundred ninety-seven thousand, four hundred fifty-three".