61681743 has 20 divisors (see below), whose sum is σ = 92861208. Its totient is φ = 40800240.

The previous prime is 61681721. The next prime is 61681751. The reversal of 61681743 is 34718616.

It is not a de Polignac number, because 61681743 - 2¹² = 61677647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61681698 and 61681707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61681783) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7705 + ... + 13517.

Almost surely, 2^61681743 is an apocalyptic number.

61681743 is a deficient number, since it is larger than the sum of its proper divisors (31179465).

61681743 is a wasteful number, since it uses less digits than its factorization.

61681743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5956 (or 5947 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 61681743 is about 7853.7725329933. The cubic root of 61681743 is about 395.1107802297.

The spelling of 61681743 in words is "sixty-one million, six hundred eighty-one thousand, seven hundred forty-three".