68151901 has 4 divisors (see below), whose sum is σ = 68314204. Its totient is φ = 67989600.

The previous prime is 68151899. The next prime is 68151911. The reversal of 68151901 is 10915186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89401 + 68062500 = 299^2 + 8250^2 .

It is a cyclic number.

It is not a de Polignac number, because 68151901 - 2¹ = 68151899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68151911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80520 + ... + 81361.

It is an arithmetic number, because the mean of its divisors is an integer number (17078551).

Almost surely, 2^68151901 is an apocalyptic number.

It is an amenable number.

68151901 is a deficient number, since it is larger than the sum of its proper divisors (162303).

68151901 is a wasteful number, since it uses less digits than its factorization.

68151901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162302.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 68151901 is about 8255.4164643584. The cubic root of 68151901 is about 408.4692094066.

The spelling of 68151901 in words is "sixty-eight million, one hundred fifty-one thousand, nine hundred one".