126631691 has 4 divisors (see below), whose sum is σ = 134080632. Its totient is φ = 119182752.

The previous prime is 126631651. The next prime is 126631697. The reversal of 126631691 is 196136621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126631691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126631697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3724445 + ... + 3724478.

It is an arithmetic number, because the mean of its divisors is an integer number (33520158).

Almost surely, 2^126631691 is an apocalyptic number.

126631691 is a deficient number, since it is larger than the sum of its proper divisors (7448941).

126631691 is an equidigital number, since it uses as much as digits as its factorization.

126631691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7448940.

The product of its digits is 11664, while the sum is 35.

The square root of 126631691 is about 11253.0747353779. The cubic root of 126631691 is about 502.1661896917.

The spelling of 126631691 in words is "one hundred twenty-six million, six hundred thirty-one thousand, six hundred ninety-one".