81630603 has 6 divisors (see below), whose sum is σ = 117910884. Its totient is φ = 54420396.

The previous prime is 81630599. The next prime is 81630607. The reversal of 81630603 is 30603618.

It is an interprime number because it is at equal distance from previous prime (81630599) and next prime (81630607).

It is not a de Polignac number, because 81630603 - 2² = 81630599 is a prime.

It is a super-2 number, since 2×81630603² = 13327110692287218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81630607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4535025 + ... + 4535042.

It is an arithmetic number, because the mean of its divisors is an integer number (19651814).

Almost surely, 2^81630603 is an apocalyptic number.

81630603 is a deficient number, since it is larger than the sum of its proper divisors (36280281).

81630603 is a wasteful number, since it uses less digits than its factorization.

81630603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9070073 (or 9070070 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 81630603 is about 9034.9655782410. The cubic root of 81630603 is about 433.7947931605.

The spelling of 81630603 in words is "eighty-one million, six hundred thirty thousand, six hundred three".