456647981 has 2 divisors, whose sum is σ = 456647982. Its totient is φ = 456647980.

The previous prime is 456647963. The next prime is 456647993. The reversal of 456647981 is 189746654.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395651881 + 60996100 = 19891^2 + 7810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-456647981 is a prime.

It is a super-2 number, since 2×456647981² = 417054757102752722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (456647941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228323990 + 228323991.

It is an arithmetic number, because the mean of its divisors is an integer number (228323991).

Almost surely, 2^456647981 is an apocalyptic number.

It is an amenable number.

456647981 is a deficient number, since it is larger than the sum of its proper divisors (1).

456647981 is an equidigital number, since it uses as much as digits as its factorization.

456647981 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 456647981 is about 21369.3233631765. The cubic root of 456647981 is about 770.0646378526.

The spelling of 456647981 in words is "four hundred fifty-six million, six hundred forty-seven thousand, nine hundred eighty-one".