126981913 has 2 divisors, whose sum is σ = 126981914. Its totient is φ = 126981912.

The previous prime is 126981893. The next prime is 126981977. The reversal of 126981913 is 319189621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65076489 + 61905424 = 8067^2 + 7868^2 .

It is an emirp because it is prime and its reverse (319189621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126981913 is a prime.

It is a super-2 number, since 2×126981913² = 32248812458279138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126981713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63490956 + 63490957.

It is an arithmetic number, because the mean of its divisors is an integer number (63490957).

Almost surely, 2^126981913 is an apocalyptic number.

It is an amenable number.

126981913 is a deficient number, since it is larger than the sum of its proper divisors (1).

126981913 is an equidigital number, since it uses as much as digits as its factorization.

126981913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 126981913 is about 11268.6251601515. The cubic root of 126981913 is about 502.6287062540.

The spelling of 126981913 in words is "one hundred twenty-six million, nine hundred eighty-one thousand, nine hundred thirteen".