61312545 has 80 divisors (see below), whose sum is σ = 127543680. Its totient is φ = 27713664.

The previous prime is 61312543. The next prime is 61312561. The reversal of 61312545 is 54521316.

61312545 is a `hidden beast` number, since 613 + 1 + 2 + 5 + 45 = 666.

61312545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61312545 - 2¹ = 61312543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61312541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 688861 + ... + 688949.

It is an arithmetic number, because the mean of its divisors is an integer number (1594296).

Almost surely, 2^61312545 is an apocalyptic number.

It is an amenable number.

61312545 is an abundant number, since it is smaller than the sum of its proper divisors (66231135).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61312545 is an frugal number, since it uses more digits than its factorization.

61312545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 104 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 61312545 is about 7830.2327551612. The cubic root of 61312545 is about 394.3208861752.

The spelling of 61312545 in words is "sixty-one million, three hundred twelve thousand, five hundred forty-five".