1355590381 has 8 divisors (see below), whose sum is σ = 1393844760. Its totient is φ = 1317805632.

The previous prime is 1355590331. The next prime is 1355590393. The reversal of 1355590381 is 1830955531.

1355590381 = 26034² + 26035².

It can be written as a sum of positive squares in 4 ways, for example, as 69722500 + 1285867881 = 8350^2 + 35859^2 .

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 1355590381 - 2⁹ = 1355589869 is a prime.

It is a super-2 number, since 2×1355590381² = 3675250562119450322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355590331) 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, 111550 + ... + 123103.

It is an arithmetic number, because the mean of its divisors is an integer number (174230595).

Almost surely, 2^1355590381 is an apocalyptic number.

1355590381 is the 26035-th centered square number.

It is an amenable number.

1355590381 is a deficient number, since it is larger than the sum of its proper divisors (38254379).

1355590381 is a wasteful number, since it uses less digits than its factorization.

1355590381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234815.

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 1355590381 is about 36818.3429963924. The cubic root of 1355590381 is about 1106.7329145254.

The spelling of 1355590381 in words is "one billion, three hundred fifty-five million, five hundred ninety thousand, three hundred eighty-one".