61421731 has 16 divisors (see below), whose sum is σ = 76144320. Its totient is φ = 48337920.

The previous prime is 61421719. The next prime is 61421741. The reversal of 61421731 is 13712416.

61421731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61421731 - 2⁹ = 61421219 is a prime.

It is a super-2 number, since 2×61421731² = 7545258078072722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61421696 and 61421705.

It is not an unprimeable number, because it can be changed into a prime (61421741) 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 15 ways as a sum of consecutive naturals, for example, 1416 + ... + 11173.

It is an arithmetic number, because the mean of its divisors is an integer number (4759020).

Almost surely, 2^61421731 is an apocalyptic number.

61421731 is a deficient number, since it is larger than the sum of its proper divisors (14722589).

61421731 is a wasteful number, since it uses less digits than its factorization.

61421731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12654.

The product of its digits is 1008, while the sum is 25.

The square root of 61421731 is about 7837.2017327615. The cubic root of 61421731 is about 394.5548175745.

The spelling of 61421731 in words is "sixty-one million, four hundred twenty-one thousand, seven hundred thirty-one".