61820563 has 4 divisors (see below), whose sum is σ = 70652080. Its totient is φ = 52989048.

The previous prime is 61820543. The next prime is 61820567. The reversal of 61820563 is 36502816.

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

It is not a de Polignac number, because 61820563 - 2⁵ = 61820531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61820567) 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, 4415748 + ... + 4415761.

It is an arithmetic number, because the mean of its divisors is an integer number (17663020).

Almost surely, 2^61820563 is an apocalyptic number.

61820563 is a deficient number, since it is larger than the sum of its proper divisors (8831517).

61820563 is an equidigital number, since it uses as much as digits as its factorization.

61820563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831516.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 61820563 is about 7862.6053570048. The cubic root of 61820563 is about 395.4069682618.

The spelling of 61820563 in words is "sixty-one million, eight hundred twenty thousand, five hundred sixty-three".