61275145 has 8 divisors (see below), whose sum is σ = 75517704. Its totient is φ = 47695104.

The previous prime is 61275143. The next prime is 61275161. The reversal of 61275145 is 54157216.

It can be written as a sum of positive squares in 4 ways, for example, as 7634169 + 53640976 = 2763^2 + 7324^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61275145 - 2¹ = 61275143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61275143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165424 + ... + 165793.

It is an arithmetic number, because the mean of its divisors is an integer number (9439713).

Almost surely, 2^61275145 is an apocalyptic number.

It is an amenable number.

61275145 is a deficient number, since it is larger than the sum of its proper divisors (14242559).

61275145 is a wasteful number, since it uses less digits than its factorization.

61275145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331259.

The product of its digits is 8400, while the sum is 31.

The square root of 61275145 is about 7827.8442115310. The cubic root of 61275145 is about 394.2406926857.

It can be divided in two parts, 612 and 75145, that added together give a palindrome (75757).

The spelling of 61275145 in words is "sixty-one million, two hundred seventy-five thousand, one hundred forty-five".