126991939 has 2 divisors, whose sum is σ = 126991940. Its totient is φ = 126991938.

The previous prime is 126991927. The next prime is 126991961. The reversal of 126991939 is 939199621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126991939 - 2⁷ = 126991811 is a prime.

It is a super-2 number, since 2×126991939² = 32253905141959442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126991892 and 126991901.

It is not a weakly prime, because it can be changed into another prime (126991919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63495969 + 63495970.

It is an arithmetic number, because the mean of its divisors is an integer number (63495970).

Almost surely, 2^126991939 is an apocalyptic number.

126991939 is a deficient number, since it is larger than the sum of its proper divisors (1).

126991939 is an equidigital number, since it uses as much as digits as its factorization.

126991939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 49.

The square root of 126991939 is about 11269.0700148681. The cubic root of 126991939 is about 502.6419344445.

The spelling of 126991939 in words is "one hundred twenty-six million, nine hundred ninety-one thousand, nine hundred thirty-nine".