423991909261 has 2 divisors, whose sum is σ = 423991909262. Its totient is φ = 423991909260.

The previous prime is 423991909249. The next prime is 423991909373. The reversal of 423991909261 is 162909199324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423397476100 + 594433161 = 650690^2 + 24381^2 .

It is a cyclic number.

It is not a de Polignac number, because 423991909261 - 2³⁷ = 286552955789 is a prime.

It is a super-2 number, since 2×423991909261² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423991901261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211995954630 + 211995954631.

It is an arithmetic number, because the mean of its divisors is an integer number (211995954631).

Almost surely, 2^423991909261 is an apocalyptic number.

It is an amenable number.

423991909261 is a deficient number, since it is larger than the sum of its proper divisors (1).

423991909261 is an equidigital number, since it uses as much as digits as its factorization.

423991909261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 55.

The spelling of 423991909261 in words is "four hundred twenty-three billion, nine hundred ninety-one million, nine hundred nine thousand, two hundred sixty-one".