1967887381 has 2 divisors, whose sum is σ = 1967887382. Its totient is φ = 1967887380.

The previous prime is 1967887237. The next prime is 1967887387. The reversal of 1967887381 is 1837887691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288451025 + 679436356 = 35895^2 + 26066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1967887381 - 2¹⁷ = 1967756309 is a prime.

It is a super-2 number, since 2×1967887381² = 7745161488598078322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1967887387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983943690 + 983943691.

It is an arithmetic number, because the mean of its divisors is an integer number (983943691).

Almost surely, 2^1967887381 is an apocalyptic number.

It is an amenable number.

1967887381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1967887381 is an equidigital number, since it uses as much as digits as its factorization.

1967887381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 1967887381 is about 44360.8766933207. The cubic root of 1967887381 is about 1253.1414065849.

The spelling of 1967887381 in words is "one billion, nine hundred sixty-seven million, eight hundred eighty-seven thousand, three hundred eighty-one".