1356690521 has 2 divisors, whose sum is σ = 1356690522. Its totient is φ = 1356690520.

The previous prime is 1356690487. The next prime is 1356690523. The reversal of 1356690521 is 1250966531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1355712400 + 978121 = 36820^2 + 989^2 .

It is an emirp because it is prime and its reverse (1250966531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1356690521 is a prime.

Together with 1356690523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1356690523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678345260 + 678345261.

It is an arithmetic number, because the mean of its divisors is an integer number (678345261).

Almost surely, 2^1356690521 is an apocalyptic number.

It is an amenable number.

1356690521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356690521 is an equidigital number, since it uses as much as digits as its factorization.

1356690521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1356690521 is about 36833.2800738680. The cubic root of 1356690521 is about 1107.0322261612.

The spelling of 1356690521 in words is "one billion, three hundred fifty-six million, six hundred ninety thousand, five hundred twenty-one".