1355617961 has 8 divisors (see below), whose sum is σ = 1435693320. Its totient is φ = 1275579648.

The previous prime is 1355617937. The next prime is 1355617969. The reversal of 1355617961 is 1697165531.

It can be written as a sum of positive squares in 4 ways, for example, as 641659561 + 713958400 = 25331^2 + 26720^2 .

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 1355617961 - 2⁶ = 1355617897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355617969) 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, 110255 + ... + 121931.

It is an arithmetic number, because the mean of its divisors is an integer number (179461665).

Almost surely, 2^1355617961 is an apocalyptic number.

It is an amenable number.

1355617961 is a deficient number, since it is larger than the sum of its proper divisors (80075359).

1355617961 is a wasteful number, since it uses less digits than its factorization.

1355617961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18523.

The product of its digits is 170100, while the sum is 44.

The square root of 1355617961 is about 36818.7175360577. The cubic root of 1355617961 is about 1106.7404201080.

The spelling of 1355617961 in words is "one billion, three hundred fifty-five million, six hundred seventeen thousand, nine hundred sixty-one".