61355649 has 8 divisors (see below), whose sum is σ = 81857952. Its totient is φ = 40878560.

The previous prime is 61355647. The next prime is 61355653. The reversal of 61355649 is 94655316.

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

It is a cyclic number.

It is not a de Polignac number, because 61355649 - 2¹ = 61355647 is a prime.

It is a super-2 number, since 2×61355649² = 7529031328422402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61355641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394 + ... + 11084.

It is an arithmetic number, because the mean of its divisors is an integer number (10232244).

Almost surely, 2^61355649 is an apocalyptic number.

It is an amenable number.

61355649 is a deficient number, since it is larger than the sum of its proper divisors (20502303).

61355649 is a wasteful number, since it uses less digits than its factorization.

61355649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12607.

The product of its digits is 97200, while the sum is 39.

The square root of 61355649 is about 7832.9846801842. The cubic root of 61355649 is about 394.4132698029.

The spelling of 61355649 in words is "sixty-one million, three hundred fifty-five thousand, six hundred forty-nine".