51061989 has 16 divisors (see below), whose sum is σ = 74539584. Its totient is φ = 30835200.

The previous prime is 51061957. The next prime is 51062003. The reversal of 51061989 is 98916015.

It is not a de Polignac number, because 51061989 - 2⁵ = 51061957 is a prime.

It is a super-2 number, since 2×51061989² = 5214653441272242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51061919) 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, 7029 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (4658724).

Almost surely, 2^51061989 is an apocalyptic number.

It is an amenable number.

51061989 is a deficient number, since it is larger than the sum of its proper divisors (23477595).

51061989 is a wasteful number, since it uses less digits than its factorization.

51061989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5588.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 51061989 is about 7145.7672086348. The cubic root of 51061989 is about 370.9931656701.

The spelling of 51061989 in words is "fifty-one million, sixty-one thousand, nine hundred eighty-nine".