61543641 has 12 divisors (see below), whose sum is σ = 86605872. Its totient is φ = 38868984.

The previous prime is 61543639. The next prime is 61543663. The reversal of 61543641 is 14634516.

It is not a de Polignac number, because 61543641 - 2¹ = 61543639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61543599 and 61543608.

It is not an unprimeable number, because it can be changed into a prime (61543631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27331 + ... + 29496.

It is an arithmetic number, because the mean of its divisors is an integer number (7217156).

Almost surely, 2^61543641 is an apocalyptic number.

It is an amenable number.

61543641 is a deficient number, since it is larger than the sum of its proper divisors (25062231).

61543641 is a wasteful number, since it uses less digits than its factorization.

61543641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56868 (or 56849 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 61543641 is about 7844.9755257744. The cubic root of 61543641 is about 394.8156828467.

The spelling of 61543641 in words is "sixty-one million, five hundred forty-three thousand, six hundred forty-one".