1067996621 has 2 divisors, whose sum is σ = 1067996622. Its totient is φ = 1067996620.

The previous prime is 1067996609. The next prime is 1067996623. The reversal of 1067996621 is 1266997601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1064716900 + 3279721 = 32630^2 + 1811^2 .

It is an emirp because it is prime and its reverse (1266997601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1067996621 - 2²² = 1063802317 is a prime.

It is a super-2 number, since 2×1067996621² = 2281233564934835282, which contains 22 as substring.

Together with 1067996623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1067996623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533998310 + 533998311.

It is an arithmetic number, because the mean of its divisors is an integer number (533998311).

Almost surely, 2^1067996621 is an apocalyptic number.

It is an amenable number.

1067996621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1067996621 is an equidigital number, since it uses as much as digits as its factorization.

1067996621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1067996621 is about 32680.2175788351. The cubic root of 1067996621 is about 1022.1703820543.

The spelling of 1067996621 in words is "one billion, sixty-seven million, nine hundred ninety-six thousand, six hundred twenty-one".