61745731 has 8 divisors (see below), whose sum is σ = 64542240. Its totient is φ = 58958592.

The previous prime is 61745693. The next prime is 61745737. The reversal of 61745731 is 13754716.

61745731 = 1136² + 1137² + ... + 1181².

61745731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61745731 - 2⁹ = 61745219 is a prime.

It is a super-3 number, since 3×61745731³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61745737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13485 + ... + 17473.

It is an arithmetic number, because the mean of its divisors is an integer number (8067780).

Almost surely, 2^61745731 is an apocalyptic number.

61745731 is a deficient number, since it is larger than the sum of its proper divisors (2796509).

61745731 is a wasteful number, since it uses less digits than its factorization.

61745731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685.

The product of its digits is 17640, while the sum is 34.

The square root of 61745731 is about 7857.8451880907. The cubic root of 61745731 is about 395.2473609523.

The spelling of 61745731 in words is "sixty-one million, seven hundred forty-five thousand, seven hundred thirty-one".