1397126641 has 2 divisors, whose sum is σ = 1397126642. Its totient is φ = 1397126640.

The previous prime is 1397126629. The next prime is 1397126723. The reversal of 1397126641 is 1466217931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310729616 + 86397025 = 36204^2 + 9295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397126641 - 2²³ = 1388738033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397126594 and 1397126603.

It is not a weakly prime, because it can be changed into another prime (1397126611) 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, 698563320 + 698563321.

It is an arithmetic number, because the mean of its divisors is an integer number (698563321).

Almost surely, 2^1397126641 is an apocalyptic number.

It is an amenable number.

1397126641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397126641 is an equidigital number, since it uses as much as digits as its factorization.

1397126641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 1397126641 is about 37378.1572713263. The cubic root of 1397126641 is about 1117.9230857660.

The spelling of 1397126641 in words is "one billion, three hundred ninety-seven million, one hundred twenty-six thousand, six hundred forty-one".