61311743 has 4 divisors (see below), whose sum is σ = 61351368. Its totient is φ = 61272120.

The previous prime is 61311709. The next prime is 61311763. The reversal of 61311743 is 34711316.

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 61311743 - 2¹⁰ = 61310719 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 (61311703) 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, 17393 + ... + 20618.

It is an arithmetic number, because the mean of its divisors is an integer number (15337842).

Almost surely, 2^61311743 is an apocalyptic number.

61311743 is a deficient number, since it is larger than the sum of its proper divisors (39625).

61311743 is a wasteful number, since it uses less digits than its factorization.

61311743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39624.

The product of its digits is 1512, while the sum is 26.

The square root of 61311743 is about 7830.1815432338. The cubic root of 61311743 is about 394.3191668602.

The spelling of 61311743 in words is "sixty-one million, three hundred eleven thousand, seven hundred forty-three".