1672766981 has 2 divisors, whose sum is σ = 1672766982. Its totient is φ = 1672766980.

The previous prime is 1672766971. The next prime is 1672766983. The reversal of 1672766981 is 1896672761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848789956 + 823977025 = 29134^2 + 28705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672766981 - 2¹⁸ = 1672504837 is a prime.

It is a super-2 number, since 2×1672766981² = 5596298745447708722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1672766983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672766983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836383490 + 836383491.

It is an arithmetic number, because the mean of its divisors is an integer number (836383491).

Almost surely, 2^1672766981 is an apocalyptic number.

It is an amenable number.

1672766981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672766981 is an equidigital number, since it uses as much as digits as its factorization.

1672766981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 1672766981 is about 40899.4740919734. The cubic root of 1672766981 is about 1187.0758846820.

The spelling of 1672766981 in words is "one billion, six hundred seventy-two million, seven hundred sixty-six thousand, nine hundred eighty-one".