243125554537 has 2 divisors, whose sum is σ = 243125554538. Its totient is φ = 243125554536.

The previous prime is 243125554501. The next prime is 243125554579. The reversal of 243125554537 is 735455521342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242264777616 + 860776921 = 492204^2 + 29339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243125554537 is a prime.

It is a super-2 number, since 2×243125554537² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243125554037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121562777268 + 121562777269.

It is an arithmetic number, because the mean of its divisors is an integer number (121562777269).

Almost surely, 2^243125554537 is an apocalyptic number.

It is an amenable number.

243125554537 is a deficient number, since it is larger than the sum of its proper divisors (1).

243125554537 is an equidigital number, since it uses as much as digits as its factorization.

243125554537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520000, while the sum is 46.

The spelling of 243125554537 in words is "two hundred forty-three billion, one hundred twenty-five million, five hundred fifty-four thousand, five hundred thirty-seven".