1368552421 has 2 divisors, whose sum is σ = 1368552422. Its totient is φ = 1368552420.

The previous prime is 1368552413. The next prime is 1368552431. The reversal of 1368552421 is 1242558631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1280924100 + 87628321 = 35790^2 + 9361^2 .

It is an emirp because it is prime and its reverse (1242558631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1368552421 - 2³ = 1368552413 is a prime.

It is a super-2 number, since 2×1368552421² = 3745871458049922482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1368552431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684276210 + 684276211.

It is an arithmetic number, because the mean of its divisors is an integer number (684276211).

Almost surely, 2^1368552421 is an apocalyptic number.

It is an amenable number.

1368552421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368552421 is an equidigital number, since it uses as much as digits as its factorization.

1368552421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 37.

The square root of 1368552421 is about 36993.9511406933. The cubic root of 1368552421 is about 1110.2492260223.

The spelling of 1368552421 in words is "one billion, three hundred sixty-eight million, five hundred fifty-two thousand, four hundred twenty-one".