61534643 has 4 divisors (see below), whose sum is σ = 62695728. Its totient is φ = 60373560.

The previous prime is 61534631. The next prime is 61534667. The reversal of 61534643 is 34643516.

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 61534643 - 2⁶ = 61534579 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61534043) 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, 580463 + ... + 580568.

It is an arithmetic number, because the mean of its divisors is an integer number (15673932).

Almost surely, 2^61534643 is an apocalyptic number.

61534643 is a deficient number, since it is larger than the sum of its proper divisors (1161085).

61534643 is a wasteful number, since it uses less digits than its factorization.

61534643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161084.

The product of its digits is 25920, while the sum is 32.

The square root of 61534643 is about 7844.4020167250. The cubic root of 61534643 is about 394.7964405410.

The spelling of 61534643 in words is "sixty-one million, five hundred thirty-four thousand, six hundred forty-three".