1355449781 has 8 divisors (see below), whose sum is σ = 1550553984. Its totient is φ = 1160712720.

The previous prime is 1355449747. The next prime is 1355449783. The reversal of 1355449781 is 1879445531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1355449781 - 2¹⁴ = 1355433397 is a prime.

It is a super-2 number, since 2×1355449781² = 3674488217625895922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355449783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83825 + ... + 98678.

It is an arithmetic number, because the mean of its divisors is an integer number (193819248).

Almost surely, 2^1355449781 is an apocalyptic number.

It is an amenable number.

1355449781 is a deficient number, since it is larger than the sum of its proper divisors (195104203).

1355449781 is a wasteful number, since it uses less digits than its factorization.

1355449781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183571.

The product of its digits is 604800, while the sum is 47.

The square root of 1355449781 is about 36816.4335725230. The cubic root of 1355449781 is about 1106.6946502557.

The spelling of 1355449781 in words is "one billion, three hundred fifty-five million, four hundred forty-nine thousand, seven hundred eighty-one".