61529863 has 4 divisors (see below), whose sum is σ = 61616160. Its totient is φ = 61443568.

The previous prime is 61529857. The next prime is 61529869. The reversal of 61529863 is 36892516.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61529857) and next prime (61529869).

It is a cyclic number.

It is not a de Polignac number, because 61529863 - 2¹⁷ = 61398791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61529869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42070 + ... + 43507.

It is an arithmetic number, because the mean of its divisors is an integer number (15404040).

Almost surely, 2^61529863 is an apocalyptic number.

61529863 is a deficient number, since it is larger than the sum of its proper divisors (86297).

61529863 is an equidigital number, since it uses as much as digits as its factorization.

61529863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86296.

The product of its digits is 77760, while the sum is 40.

The square root of 61529863 is about 7844.0973349392. The cubic root of 61529863 is about 394.7862177041.

The spelling of 61529863 in words is "sixty-one million, five hundred twenty-nine thousand, eight hundred sixty-three".