61883991 has 24 divisors (see below), whose sum is σ = 96585216. Its totient is φ = 37955520.

The previous prime is 61883989. The next prime is 61884001. The reversal of 61883991 is 19938816.

61883991 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 61883991 - 2¹ = 61883989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61883911) 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 23 ways as a sum of consecutive naturals, for example, 44121 + ... + 45501.

It is an arithmetic number, because the mean of its divisors is an integer number (4024384).

Almost surely, 2^61883991 is an apocalyptic number.

61883991 is a deficient number, since it is larger than the sum of its proper divisors (34701225).

61883991 is a wasteful number, since it uses less digits than its factorization.

61883991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783 (or 1780 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 61883991 is about 7866.6378459924. The cubic root of 61883991 is about 395.5421514410.

The spelling of 61883991 in words is "sixty-one million, eight hundred eighty-three thousand, nine hundred ninety-one".