61537543 has 2 divisors, whose sum is σ = 61537544. Its totient is φ = 61537542.

The previous prime is 61537513. The next prime is 61537547. The reversal of 61537543 is 34573516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61537543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61537499 and 61537508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61537547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30768771 + 30768772.

It is an arithmetic number, because the mean of its divisors is an integer number (30768772).

Almost surely, 2^61537543 is an apocalyptic number.

61537543 is a deficient number, since it is larger than the sum of its proper divisors (1).

61537543 is an equidigital number, since it uses as much as digits as its factorization.

61537543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 34.

The square root of 61537543 is about 7844.5868597397. The cubic root of 61537543 is about 394.8026424225.

The spelling of 61537543 in words is "sixty-one million, five hundred thirty-seven thousand, five hundred forty-three".