201357661 has 2 divisors, whose sum is σ = 201357662. Its totient is φ = 201357660.

The previous prime is 201357659. The next prime is 201357677. The reversal of 201357661 is 166753102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186841561 + 14516100 = 13669^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 201357661 - 2¹ = 201357659 is a prime.

Together with 201357659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201357631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100678830 + 100678831.

It is an arithmetic number, because the mean of its divisors is an integer number (100678831).

Almost surely, 2^201357661 is an apocalyptic number.

It is an amenable number.

201357661 is a deficient number, since it is larger than the sum of its proper divisors (1).

201357661 is an equidigital number, since it uses as much as digits as its factorization.

201357661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 201357661 is about 14190.0550034170. The cubic root of 201357661 is about 586.1238395681.

The spelling of 201357661 in words is "two hundred one million, three hundred fifty-seven thousand, six hundred sixty-one".