61240545 has 48 divisors (see below), whose sum is σ = 113190480. Its totient is φ = 30629376.

The previous prime is 61240541. The next prime is 61240561. The reversal of 61240545 is 54504216.

61240545 is a `hidden beast` number, since 612 + 4 + 0 + 5 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 2396304 + 58844241 = 1548^2 + 7671^2 .

It is not a de Polignac number, because 61240545 - 2² = 61240541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61240541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 220947 + ... + 221223.

It is an arithmetic number, because the mean of its divisors is an integer number (2358135).

Almost surely, 2^61240545 is an apocalyptic number.

It is an amenable number.

61240545 is a deficient number, since it is larger than the sum of its proper divisors (51949935).

61240545 is a wasteful number, since it uses less digits than its factorization.

61240545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 61240545 is about 7825.6338401436. The cubic root of 61240545 is about 394.1664739235.

The spelling of 61240545 in words is "sixty-one million, two hundred forty thousand, five hundred forty-five".