55131469 has 2 divisors, whose sum is σ = 55131470. Its totient is φ = 55131468.

The previous prime is 55131449. The next prime is 55131473. The reversal of 55131469 is 96413155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49070025 + 6061444 = 7005^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 55131469 - 2¹⁹ = 54607181 is a prime.

It is a super-2 number, since 2×55131469² = 6078957748195922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55131409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27565734 + 27565735.

It is an arithmetic number, because the mean of its divisors is an integer number (27565735).

Almost surely, 2^55131469 is an apocalyptic number.

It is an amenable number.

55131469 is a deficient number, since it is larger than the sum of its proper divisors (1).

55131469 is an equidigital number, since it uses as much as digits as its factorization.

55131469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 55131469 is about 7425.0568347993. The cubic root of 55131469 is about 380.5980172991.

It can be divided in two parts, 5513146 and 9, that added together give a palindrome (5513155).

The spelling of 55131469 in words is "fifty-five million, one hundred thirty-one thousand, four hundred sixty-nine".