61381989 has 16 divisors (see below), whose sum is σ = 95723200. Its totient is φ = 38767248.

The previous prime is 61381937. The next prime is 61381993. The reversal of 61381989 is 98918316.

It is not a de Polignac number, because 61381989 - 2¹² = 61377893 is a prime.

It is a super-2 number, since 2×61381989² = 7535497147192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59314 + ... + 60339.

It is an arithmetic number, because the mean of its divisors is an integer number (5982700).

Almost surely, 2^61381989 is an apocalyptic number.

It is an amenable number.

61381989 is a deficient number, since it is larger than the sum of its proper divisors (34341211).

61381989 is a wasteful number, since it uses less digits than its factorization.

61381989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119681 (or 119675 counting only the distinct ones).

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

The square root of 61381989 is about 7834.6658512026. The cubic root of 61381989 is about 394.4697023097.

The spelling of 61381989 in words is "sixty-one million, three hundred eighty-one thousand, nine hundred eighty-nine".