67781121 has 4 divisors (see below), whose sum is σ = 90374832. Its totient is φ = 45187412.

The previous prime is 67781101. The next prime is 67781137. The reversal of 67781121 is 12118776.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67781121 - 2¹⁸ = 67518977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67781101) 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, 11296851 + ... + 11296856.

It is an arithmetic number, because the mean of its divisors is an integer number (22593708).

Almost surely, 2^67781121 is an apocalyptic number.

It is an amenable number.

67781121 is a deficient number, since it is larger than the sum of its proper divisors (22593711).

67781121 is a wasteful number, since it uses less digits than its factorization.

67781121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22593710.

The product of its digits is 4704, while the sum is 33.

The square root of 67781121 is about 8232.9290656485. The cubic root of 67781121 is about 407.7271038908.

Adding to 67781121 its reverse (12118776), we get a palindrome (79899897).

The spelling of 67781121 in words is "sixty-seven million, seven hundred eighty-one thousand, one hundred twenty-one".