61013945 has 8 divisors (see below), whose sum is σ = 75002760. Its totient is φ = 47620480.

The previous prime is 61013929. The next prime is 61013957. The reversal of 61013945 is 54931016.

It can be written as a sum of positive squares in 4 ways, for example, as 609961 + 60403984 = 781^2 + 7772^2 .

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

It is not a de Polignac number, because 61013945 - 2⁴ = 61013929 is a prime.

It is a super-3 number, since 3×61013945³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

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, 148610 + ... + 149019.

It is an arithmetic number, because the mean of its divisors is an integer number (9375345).

Almost surely, 2^61013945 is an apocalyptic number.

It is an amenable number.

61013945 is a deficient number, since it is larger than the sum of its proper divisors (13988815).

61013945 is a wasteful number, since it uses less digits than its factorization.

61013945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297675.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 61013945 is about 7811.1423620364. The cubic root of 61013945 is about 393.6797129936.

The spelling of 61013945 in words is "sixty-one million, thirteen thousand, nine hundred forty-five".