61537545 has 12 divisors (see below), whose sum is σ = 106665156. Its totient is φ = 32820000.

The previous prime is 61537543. The next prime is 61537547. The reversal of 61537545 is 54573516.

61537545 is a `hidden beast` number, since 61 + 53 + 7 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (61537543) and next prime (61537547).

It can be written as a sum of positive squares in 2 ways, for example, as 34539129 + 26998416 = 5877^2 + 5196^2 .

It is not a de Polignac number, because 61537545 - 2¹ = 61537543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61537543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 683706 + ... + 683795.

It is an arithmetic number, because the mean of its divisors is an integer number (8888763).

Almost surely, 2^61537545 is an apocalyptic number.

It is an amenable number.

61537545 is a deficient number, since it is larger than the sum of its proper divisors (45127611).

61537545 is a wasteful number, since it uses less digits than its factorization.

61537545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367512 (or 1367509 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 61537545 is about 7844.5869872161. The cubic root of 61537545 is about 394.8026466996.

The spelling of 61537545 in words is "sixty-one million, five hundred thirty-seven thousand, five hundred forty-five".