68949521 has 2 divisors, whose sum is σ = 68949522. Its totient is φ = 68949520.

The previous prime is 68949493. The next prime is 68949563. The reversal of 68949521 is 12594986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 33189121 = 5980^2 + 5761^2 .

It is a cyclic number.

It is not a de Polignac number, because 68949521 - 2¹⁰ = 68948497 is a prime.

It is a super-2 number, since 2×68949521² = 9508072892258882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68949121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34474760 + 34474761.

It is an arithmetic number, because the mean of its divisors is an integer number (34474761).

Almost surely, 2^68949521 is an apocalyptic number.

It is an amenable number.

68949521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68949521 is an equidigital number, since it uses as much as digits as its factorization.

68949521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 68949521 is about 8303.5848282534. The cubic root of 68949521 is about 410.0565478221.

The spelling of 68949521 in words is "sixty-eight million, nine hundred forty-nine thousand, five hundred twenty-one".