151641661 has 2 divisors, whose sum is σ = 151641662. Its totient is φ = 151641660.

The previous prime is 151641643. The next prime is 151641673. The reversal of 151641661 is 166146151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 15452761 = 11670^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 151641661 - 2²³ = 143253053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151641761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75820830 + 75820831.

It is an arithmetic number, because the mean of its divisors is an integer number (75820831).

Almost surely, 2^151641661 is an apocalyptic number.

It is an amenable number.

151641661 is a deficient number, since it is larger than the sum of its proper divisors (1).

151641661 is an equidigital number, since it uses as much as digits as its factorization.

151641661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 151641661 is about 12314.2868652635. The cubic root of 151641661 is about 533.2606171260.

The spelling of 151641661 in words is "one hundred fifty-one million, six hundred forty-one thousand, six hundred sixty-one".