61240549 has 4 divisors (see below), whose sum is σ = 61265836. Its totient is φ = 61215264.

The previous prime is 61240541. The next prime is 61240561. The reversal of 61240549 is 94504216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34304449 + 26936100 = 5857^2 + 5190^2 .

It is a cyclic number.

It is not a de Polignac number, because 61240549 - 2³ = 61240541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61240549.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8574 + ... + 13999.

It is an arithmetic number, because the mean of its divisors is an integer number (15316459).

Almost surely, 2^61240549 is an apocalyptic number.

It is an amenable number.

61240549 is a deficient number, since it is larger than the sum of its proper divisors (25287).

61240549 is a wasteful number, since it uses less digits than its factorization.

61240549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25286.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 61240549 is about 7825.6340957139. The cubic root of 61240549 is about 394.1664825053.

The spelling of 61240549 in words is "sixty-one million, two hundred forty thousand, five hundred forty-nine".