61698145 has 8 divisors (see below), whose sum is σ = 75251880. Its totient is φ = 48549120.

The previous prime is 61698137. The next prime is 61698179. The reversal of 61698145 is 54189616.

61698145 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 4 ways, for example, as 2531281 + 59166864 = 1591^2 + 7692^2 .

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

It is not a de Polignac number, because 61698145 - 2³ = 61698137 is a prime.

It is a super-2 number, since 2×61698145² = 7613322192882050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 61698098 and 61698107.

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 7 ways as a sum of consecutive naturals, for example, 100840 + ... + 101449.

It is an arithmetic number, because the mean of its divisors is an integer number (9406485).

Almost surely, 2^61698145 is an apocalyptic number.

It is an amenable number.

61698145 is a deficient number, since it is larger than the sum of its proper divisors (13553735).

61698145 is a wasteful number, since it uses less digits than its factorization.

61698145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202355.

The product of its digits is 51840, while the sum is 40.

The square root of 61698145 is about 7854.8166751363. The cubic root of 61698145 is about 395.1457988719.

The spelling of 61698145 in words is "sixty-one million, six hundred ninety-eight thousand, one hundred forty-five".