61725731 has 8 divisors (see below), whose sum is σ = 63686784. Its totient is φ = 59780160.

The previous prime is 61725709. The next prime is 61725733. The reversal of 61725731 is 13752716.

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

It is not a de Polignac number, because 61725731 - 2¹⁸ = 61463587 is a prime.

It is a super-2 number, since 2×61725731² = 7620131734968722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61725733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4511 + ... + 11991.

It is an arithmetic number, because the mean of its divisors is an integer number (7960848).

Almost surely, 2^61725731 is an apocalyptic number.

61725731 is a deficient number, since it is larger than the sum of its proper divisors (1961053).

61725731 is a wasteful number, since it uses less digits than its factorization.

61725731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7741.

The product of its digits is 8820, while the sum is 32.

The square root of 61725731 is about 7856.5724715044. The cubic root of 61725731 is about 395.2046816138.

The spelling of 61725731 in words is "sixty-one million, seven hundred twenty-five thousand, seven hundred thirty-one".