1355234161 has 4 divisors (see below), whose sum is σ = 1398951424. Its totient is φ = 1311516900.

The previous prime is 1355234107. The next prime is 1355234191. The reversal of 1355234161 is 1614325531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355234161 is a prime.

It is a super-2 number, since 2×1355234161² = 3673319262282747842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 43717231 = 1355234161 / (1 + 3 + 5 + 5 + 2 + 3 + 4 + 1 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355234191) 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, 21858585 + ... + 21858646.

It is an arithmetic number, because the mean of its divisors is an integer number (349737856).

Almost surely, 2^1355234161 is an apocalyptic number.

1355234161 is the 16464-th centered decagonal number.

It is an amenable number.

1355234161 is a deficient number, since it is larger than the sum of its proper divisors (43717263).

1355234161 is an equidigital number, since it uses as much as digits as its factorization.

1355234161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43717262.

The product of its digits is 10800, while the sum is 31.

The square root of 1355234161 is about 36813.5051441723. The cubic root of 1355234161 is about 1106.6359641629.

Adding to 1355234161 its reverse (1614325531), we get a palindrome (2969559692).

The spelling of 1355234161 in words is "one billion, three hundred fifty-five million, two hundred thirty-four thousand, one hundred sixty-one".