1201355657 has 2 divisors, whose sum is σ = 1201355658. Its totient is φ = 1201355656.

The previous prime is 1201355633. The next prime is 1201355663. The reversal of 1201355657 is 7565531021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1105629001 + 95726656 = 33251^2 + 9784^2 .

It is an emirp because it is prime and its reverse (7565531021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201355657 - 2⁸ = 1201355401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201355557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600677828 + 600677829.

It is an arithmetic number, because the mean of its divisors is an integer number (600677829).

Almost surely, 2^1201355657 is an apocalyptic number.

It is an amenable number.

1201355657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201355657 is an equidigital number, since it uses as much as digits as its factorization.

1201355657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 1201355657 is about 34660.5778515016. The cubic root of 1201355657 is about 1063.0585853991.

Adding to 1201355657 its reverse (7565531021), we get a palindrome (8766886678).

The spelling of 1201355657 in words is "one billion, two hundred one million, three hundred fifty-five thousand, six hundred fifty-seven".