220641431 has 2 divisors, whose sum is σ = 220641432. Its totient is φ = 220641430.

The previous prime is 220641409. The next prime is 220641437. The reversal of 220641431 is 134146022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220641431 is a prime.

It is a super-2 number, since 2×220641431² = 97365282147455522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220641397 and 220641406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220641437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110320715 + 110320716.

It is an arithmetic number, because the mean of its divisors is an integer number (110320716).

Almost surely, 2^220641431 is an apocalyptic number.

220641431 is a deficient number, since it is larger than the sum of its proper divisors (1).

220641431 is an equidigital number, since it uses as much as digits as its factorization.

220641431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 220641431 is about 14854.0038710107. The cubic root of 220641431 is about 604.2672010097.

Adding to 220641431 its reverse (134146022), we get a palindrome (354787453).

The spelling of 220641431 in words is "two hundred twenty million, six hundred forty-one thousand, four hundred thirty-one".