168456749 has 2 divisors, whose sum is σ = 168456750. Its totient is φ = 168456748.

The previous prime is 168456727. The next prime is 168456763. The reversal of 168456749 is 947654861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108889225 + 59567524 = 10435^2 + 7718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168456749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168456697 and 168456706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168456779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84228374 + 84228375.

It is an arithmetic number, because the mean of its divisors is an integer number (84228375).

Almost surely, 2^168456749 is an apocalyptic number.

It is an amenable number.

168456749 is a deficient number, since it is larger than the sum of its proper divisors (1).

168456749 is an equidigital number, since it uses as much as digits as its factorization.

168456749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 168456749 is about 12979.0889125547. The cubic root of 168456749 is about 552.2844366988.

The spelling of 168456749 in words is "one hundred sixty-eight million, four hundred fifty-six thousand, seven hundred forty-nine".