65919121 has 8 divisors (see below), whose sum is σ = 67291560. Its totient is φ = 64551552.

The previous prime is 65919083. The next prime is 65919137. The reversal of 65919121 is 12191956.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18584721 + 47334400 = 4311^2 + 6880^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65919121 - 2⁹ = 65918609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65911121) 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, 40165 + ... + 41773.

It is an arithmetic number, because the mean of its divisors is an integer number (8411445).

Almost surely, 2^65919121 is an apocalyptic number.

It is an amenable number.

65919121 is a deficient number, since it is larger than the sum of its proper divisors (1372439).

65919121 is a wasteful number, since it uses less digits than its factorization.

65919121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435.

The product of its digits is 4860, while the sum is 34.

The square root of 65919121 is about 8119.0591203661. The cubic root of 65919121 is about 403.9588580951.

The spelling of 65919121 in words is "sixty-five million, nine hundred nineteen thousand, one hundred twenty-one".