61009911 has 12 divisors (see below), whose sum is σ = 88820992. Its totient is φ = 40352256.

The previous prime is 61009909. The next prime is 61009913. The reversal of 61009911 is 11990016.

It is an interprime number because it is at equal distance from previous prime (61009909) and next prime (61009913).

It is not a de Polignac number, because 61009911 - 2¹ = 61009909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61009913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25546 + ... + 27831.

Almost surely, 2^61009911 is an apocalyptic number.

61009911 is a deficient number, since it is larger than the sum of its proper divisors (27811081).

61009911 is a wasteful number, since it uses less digits than its factorization.

61009911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53510 (or 53507 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 61009911 is about 7810.8841368951. The cubic root of 61009911 is about 393.6710366221.

Adding to 61009911 its reverse (11990016), we get a palindrome (72999927).

The spelling of 61009911 in words is "sixty-one million, nine thousand, nine hundred eleven".