61219989 has 8 divisors (see below), whose sum is σ = 90696320. Its totient is φ = 40813308.

The previous prime is 61219933. The next prime is 61219999. The reversal of 61219989 is 98991216.

It is not a de Polignac number, because 61219989 - 2⁷ = 61219861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61219999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133677 + ... + 1133730.

It is an arithmetic number, because the mean of its divisors is an integer number (11337040).

Almost surely, 2^61219989 is an apocalyptic number.

It is an amenable number.

61219989 is a deficient number, since it is larger than the sum of its proper divisors (29476331).

61219989 is a wasteful number, since it uses less digits than its factorization.

61219989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267416 (or 2267410 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 61219989 is about 7824.3203538710. The cubic root of 61219989 is about 394.1223670181.

It can be divided in two parts, 6121 and 9989, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 61219989 in words is "sixty-one million, two hundred nineteen thousand, nine hundred eighty-nine".