61499945 has 24 divisors (see below), whose sum is σ = 81089496. Its totient is φ = 44748288.

The previous prime is 61499891. The next prime is 61499983. The reversal of 61499945 is 54999416.

61499945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 20693401 + 40806544 = 4549^2 + 6388^2 .

It is not a de Polignac number, because 61499945 - 2⁶ = 61499881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61499945.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 61187 + ... + 62183.

It is an arithmetic number, because the mean of its divisors is an integer number (3378729).

Almost surely, 2^61499945 is an apocalyptic number.

61499945 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61499945 is a deficient number, since it is larger than the sum of its proper divisors (19589551).

61499945 is a wasteful number, since it uses less digits than its factorization.

61499945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1088 counting only the distinct ones).

The product of its digits is 349920, while the sum is 47.

The square root of 61499945 is about 7842.1900640064. The cubic root of 61499945 is about 394.7222209805.

The spelling of 61499945 in words is "sixty-one million, four hundred ninety-nine thousand, nine hundred forty-five".