126394991 has 2 divisors, whose sum is σ = 126394992. Its totient is φ = 126394990.

The previous prime is 126394903. The next prime is 126394993. The reversal of 126394991 is 199493621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126394991 - 2²⁶ = 59286127 is a prime.

Together with 126394993, 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 (126394993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63197495 + 63197496.

It is an arithmetic number, because the mean of its divisors is an integer number (63197496).

Almost surely, 2^126394991 is an apocalyptic number.

126394991 is a deficient number, since it is larger than the sum of its proper divisors (1).

126394991 is an equidigital number, since it uses as much as digits as its factorization.

126394991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 126394991 is about 11242.5526905592. The cubic root of 126394991 is about 501.8531114709.

The spelling of 126394991 in words is "one hundred twenty-six million, three hundred ninety-four thousand, nine hundred ninety-one".