61503943 has 4 divisors (see below), whose sum is σ = 65121840. Its totient is φ = 57886048.

The previous prime is 61503899. The next prime is 61503947. The reversal of 61503943 is 34930516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61503943 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 (61503947) 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, 1808923 + ... + 1808956.

It is an arithmetic number, because the mean of its divisors is an integer number (16280460).

Almost surely, 2^61503943 is an apocalyptic number.

61503943 is a deficient number, since it is larger than the sum of its proper divisors (3617897).

61503943 is a wasteful number, since it uses less digits than its factorization.

61503943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617896.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 61503943 is about 7842.4449631477. Note that the first 3 decimals coincide. The cubic root of 61503943 is about 394.7307741873.

The spelling of 61503943 in words is "sixty-one million, five hundred three thousand, nine hundred forty-three".