61501543 has 2 divisors, whose sum is σ = 61501544. Its totient is φ = 61501542.

The previous prime is 61501519. The next prime is 61501607. The reversal of 61501543 is 34510516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61501543 - 2¹⁷ = 61370471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61501343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750771 + 30750772.

It is an arithmetic number, because the mean of its divisors is an integer number (30750772).

Almost surely, 2^61501543 is an apocalyptic number.

61501543 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501543 is an equidigital number, since it uses as much as digits as its factorization.

61501543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 61501543 is about 7842.2919481488. The cubic root of 61501543 is about 394.7256397404.

The spelling of 61501543 in words is "sixty-one million, five hundred one thousand, five hundred forty-three".