291431428369 has 2 divisors, whose sum is σ = 291431428370. Its totient is φ = 291431428368.

The previous prime is 291431428333. The next prime is 291431428373. The reversal of 291431428369 is 963824134192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287363539969 + 4067888400 = 536063^2 + 63780^2 .

It is a cyclic number.

It is not a de Polignac number, because 291431428369 - 2¹⁹ = 291430904081 is a prime.

It is a super-2 number, since 2×291431428369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (291431428969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145715714184 + 145715714185.

It is an arithmetic number, because the mean of its divisors is an integer number (145715714185).

Almost surely, 2^291431428369 is an apocalyptic number.

It is an amenable number.

291431428369 is a deficient number, since it is larger than the sum of its proper divisors (1).

291431428369 is an equidigital number, since it uses as much as digits as its factorization.

291431428369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 52.

The spelling of 291431428369 in words is "two hundred ninety-one billion, four hundred thirty-one million, four hundred twenty-eight thousand, three hundred sixty-nine".