61031405 has 16 divisors (see below), whose sum is σ = 77366784. Its totient is φ = 46146240.

The previous prime is 61031393. The next prime is 61031407. The reversal of 61031405 is 50413016.

It is not a de Polignac number, because 61031405 - 2⁸ = 61031149 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 (61031407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2087 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (4835424).

Almost surely, 2^61031405 is an apocalyptic number.

It is an amenable number.

61031405 is a deficient number, since it is larger than the sum of its proper divisors (16335379).

61031405 is a wasteful number, since it uses less digits than its factorization.

61031405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9236.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61031405 is about 7812.2599163110. The cubic root of 61031405 is about 393.7172617443.

The spelling of 61031405 in words is "sixty-one million, thirty-one thousand, four hundred five".