61321145 has 8 divisors (see below), whose sum is σ = 74237256. Its totient is φ = 48622336.

The previous prime is 61321129. The next prime is 61321163. The reversal of 61321145 is 54112316.

It can be written as a sum of positive squares in 4 ways, for example, as 6620329 + 54700816 = 2573^2 + 7396^2 .

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 61321145 - 2⁴ = 61321129 is a prime.

It is a super-2 number, since 2×61321145² = 7520565648222050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61321145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53702 + ... + 54831.

It is an arithmetic number, because the mean of its divisors is an integer number (9279657).

Almost surely, 2^61321145 is an apocalyptic number.

It is an amenable number.

61321145 is a deficient number, since it is larger than the sum of its proper divisors (12916111).

61321145 is a wasteful number, since it uses less digits than its factorization.

61321145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108651.

The product of its digits is 720, while the sum is 23.

The square root of 61321145 is about 7830.7818894412. The cubic root of 61321145 is about 394.3393217774.

The spelling of 61321145 in words is "sixty-one million, three hundred twenty-one thousand, one hundred forty-five".