126787631 has 2 divisors, whose sum is σ = 126787632. Its totient is φ = 126787630.

The previous prime is 126787597. The next prime is 126787657. The reversal of 126787631 is 136787621.

It is a strong prime.

It is an emirp because it is prime and its reverse (136787621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126787631 - 2¹⁴ = 126771247 is a prime.

It is a super-2 number, since 2×126787631² = 32150206749184322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126787691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63393815 + 63393816.

It is an arithmetic number, because the mean of its divisors is an integer number (63393816).

Almost surely, 2^126787631 is an apocalyptic number.

126787631 is a deficient number, since it is larger than the sum of its proper divisors (1).

126787631 is an equidigital number, since it uses as much as digits as its factorization.

126787631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 126787631 is about 11260.0013765541. The cubic root of 126787631 is about 502.3722352006.

The spelling of 126787631 in words is "one hundred twenty-six million, seven hundred eighty-seven thousand, six hundred thirty-one".