1355665097 has 4 divisors (see below), whose sum is σ = 1355789460. Its totient is φ = 1355540736.

The previous prime is 1355665079. The next prime is 1355665139. The reversal of 1355665097 is 7905665531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 741418441 + 614246656 = 27229^2 + 24784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355665097 - 2¹⁸ = 1355402953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355665897) 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, 44072 + ... + 68217.

It is an arithmetic number, because the mean of its divisors is an integer number (338947365).

Almost surely, 2^1355665097 is an apocalyptic number.

It is an amenable number.

1355665097 is a deficient number, since it is larger than the sum of its proper divisors (124363).

1355665097 is a wasteful number, since it uses less digits than its factorization.

1355665097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124362.

The product of its (nonzero) digits is 850500, while the sum is 47.

The square root of 1355665097 is about 36819.3576396982. The cubic root of 1355665097 is about 1106.7532473974.

The spelling of 1355665097 in words is "one billion, three hundred fifty-five million, six hundred sixty-five thousand, ninety-seven".