1356545521 has 2 divisors, whose sum is σ = 1356545522. Its totient is φ = 1356545520.

The previous prime is 1356545471. The next prime is 1356545573. The reversal of 1356545521 is 1255456531.

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., 1326416400 + 30129121 = 36420^2 + 5489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356545521 - 2⁹ = 1356545009 is a prime.

It is a super-2 number, since 2×1356545521² = 3680431501090322882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1356545581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678272760 + 678272761.

It is an arithmetic number, because the mean of its divisors is an integer number (678272761).

Almost surely, 2^1356545521 is an apocalyptic number.

It is an amenable number.

1356545521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356545521 is an equidigital number, since it uses as much as digits as its factorization.

1356545521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90000, while the sum is 37.

The square root of 1356545521 is about 36831.3116926346. The cubic root of 1356545521 is about 1106.9927857265.

The spelling of 1356545521 in words is "one billion, three hundred fifty-six million, five hundred forty-five thousand, five hundred twenty-one".