61813503 has 16 divisors (see below), whose sum is σ = 92682240. Its totient is φ = 40711032.

The previous prime is 61813501. The next prime is 61813561. The reversal of 61813503 is 30531816.

It is not a de Polignac number, because 61813503 - 2¹ = 61813501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61813501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11551 + ... + 16032.

It is an arithmetic number, because the mean of its divisors is an integer number (5792640).

Almost surely, 2^61813503 is an apocalyptic number.

61813503 is a deficient number, since it is larger than the sum of its proper divisors (30868737).

61813503 is a wasteful number, since it uses less digits than its factorization.

61813503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27675 (or 27669 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61813503 is about 7862.1563835884. The cubic root of 61813503 is about 395.3919156680.

The spelling of 61813503 in words is "sixty-one million, eight hundred thirteen thousand, five hundred three".