1369194721 has 2 divisors, whose sum is σ = 1369194722. Its totient is φ = 1369194720.

The previous prime is 1369194707. The next prime is 1369194727. The reversal of 1369194721 is 1274919631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723018321 + 646176400 = 26889^2 + 25420^2 .

It is an emirp because it is prime and its reverse (1274919631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1369194721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1369194727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684597360 + 684597361.

It is an arithmetic number, because the mean of its divisors is an integer number (684597361).

Almost surely, 2^1369194721 is an apocalyptic number.

It is an amenable number.

1369194721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1369194721 is an equidigital number, since it uses as much as digits as its factorization.

1369194721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 1369194721 is about 37002.6312713029. The cubic root of 1369194721 is about 1110.4228892143.

The spelling of 1369194721 in words is "one billion, three hundred sixty-nine million, one hundred ninety-four thousand, seven hundred twenty-one".