351661 has 2 divisors, whose sum is σ = 351662. Its totient is φ = 351660.

The previous prime is 351653. The next prime is 351667. The reversal of 351661 is 166153.

351661 is nontrivially palindromic in base 14.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265225 + 86436 = 515^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 351661 - 2³ = 351653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175830 + 175831.

It is an arithmetic number, because the mean of its divisors is an integer number (175831).

2³⁵¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

351661 is a deficient number, since it is larger than the sum of its proper divisors (1).

351661 is an equidigital number, since it uses as much as digits as its factorization.

351661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 351661 is about 593.0101179575. The cubic root of 351661 is about 70.5842929852.

The spelling of 351661 in words is "three hundred fifty-one thousand, six hundred sixty-one".