669126131 has 2 divisors, whose sum is σ = 669126132. Its totient is φ = 669126130.

The previous prime is 669126127. The next prime is 669126197. The reversal of 669126131 is 131621966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669126131 - 2² = 669126127 is a prime.

It is a super-2 number, since 2×669126131² = 895459558374058322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669126091 and 669126100.

It is not a weakly prime, because it can be changed into another prime (669123131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334563065 + 334563066.

It is an arithmetic number, because the mean of its divisors is an integer number (334563066).

Almost surely, 2^669126131 is an apocalyptic number.

669126131 is a deficient number, since it is larger than the sum of its proper divisors (1).

669126131 is an equidigital number, since it uses as much as digits as its factorization.

669126131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 669126131 is about 25867.4724509373. The cubic root of 669126131 is about 874.6534163705.

The spelling of 669126131 in words is "six hundred sixty-nine million, one hundred twenty-six thousand, one hundred thirty-one".