1355562221 has 4 divisors (see below), whose sum is σ = 1459836252. Its totient is φ = 1251288192.

The previous prime is 1355562211. The next prime is 1355562233. The reversal of 1355562221 is 1222655531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222655531 = 31 ⋅39440501.

It can be written as a sum of positive squares in 2 ways, for example, as 267486025 + 1088076196 = 16355^2 + 32986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355562221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355562211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52136996 + ... + 52137021.

It is an arithmetic number, because the mean of its divisors is an integer number (364959063).

Almost surely, 2^1355562221 is an apocalyptic number.

It is an amenable number.

1355562221 is a deficient number, since it is larger than the sum of its proper divisors (104274031).

1355562221 is a wasteful number, since it uses less digits than its factorization.

1355562221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104274030.

The product of its digits is 18000, while the sum is 32.

The square root of 1355562221 is about 36817.9605763274. The cubic root of 1355562221 is about 1106.7252509974.

The spelling of 1355562221 in words is "one billion, three hundred fifty-five million, five hundred sixty-two thousand, two hundred twenty-one".