1201311431 has 2 divisors, whose sum is σ = 1201311432. Its totient is φ = 1201311430.

The previous prime is 1201311383. The next prime is 1201311437. The reversal of 1201311431 is 1341131021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201311431 - 2²² = 1197117127 is a prime.

It is a super-2 number, since 2×1201311431² = 2886298308502535522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201311437) 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, 600655715 + 600655716.

It is an arithmetic number, because the mean of its divisors is an integer number (600655716).

Almost surely, 2^1201311431 is an apocalyptic number.

1201311431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201311431 is an equidigital number, since it uses as much as digits as its factorization.

1201311431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1201311431 is about 34659.9398585745. The cubic root of 1201311431 is about 1063.0455403013.

Adding to 1201311431 its reverse (1341131021), we get a palindrome (2542442452).

The spelling of 1201311431 in words is "one billion, two hundred one million, three hundred eleven thousand, four hundred thirty-one".