61311445 has 16 divisors (see below), whose sum is σ = 82680192. Its totient is φ = 43306560.

The previous prime is 61311403. The next prime is 61311451. The reversal of 61311445 is 54411316.

It is not a de Polignac number, because 61311445 - 2⁹ = 61310933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19011 + ... + 22000.

It is an arithmetic number, because the mean of its divisors is an integer number (5167512).

Almost surely, 2^61311445 is an apocalyptic number.

61311445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61311445 is a deficient number, since it is larger than the sum of its proper divisors (21368747).

61311445 is a wasteful number, since it uses less digits than its factorization.

61311445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41052.

The product of its digits is 1440, while the sum is 25.

The square root of 61311445 is about 7830.1625142777. The cubic root of 61311445 is about 394.3185280087.

The spelling of 61311445 in words is "sixty-one million, three hundred eleven thousand, four hundred forty-five".