61131503 has 4 divisors (see below), whose sum is σ = 61158120. Its totient is φ = 61104888.

The previous prime is 61131487. The next prime is 61131527. The reversal of 61131503 is 30513116.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61131503 - 2⁴ = 61131487 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 (61131583) 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, 9500 + ... + 14577.

It is an arithmetic number, because the mean of its divisors is an integer number (15289530).

Almost surely, 2^61131503 is an apocalyptic number.

61131503 is a deficient number, since it is larger than the sum of its proper divisors (26617).

61131503 is a wasteful number, since it uses less digits than its factorization.

61131503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26616.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 61131503 is about 7818.6637605156. The cubic root of 61131503 is about 393.9323902473.

Adding to 61131503 its reverse (30513116), we get a palindrome (91644619).

The spelling of 61131503 in words is "sixty-one million, one hundred thirty-one thousand, five hundred three".