67781131 has 8 divisors (see below), whose sum is σ = 74880000. Its totient is φ = 60838440.

The previous prime is 67781101. The next prime is 67781137. The reversal of 67781131 is 13118776.

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 67781131 - 2⁵ = 67781099 is a prime.

It is a super-2 number, since 2×67781131² = 9188563439278322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67781137) 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, 38131 + ... + 39868.

It is an arithmetic number, because the mean of its divisors is an integer number (9360000).

Almost surely, 2^67781131 is an apocalyptic number.

67781131 is a deficient number, since it is larger than the sum of its proper divisors (7098869).

67781131 is a wasteful number, since it uses less digits than its factorization.

67781131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78089.

The product of its digits is 7056, while the sum is 34.

The square root of 67781131 is about 8232.9296729658. The cubic root of 67781131 is about 407.7271239420.

The spelling of 67781131 in words is "sixty-seven million, seven hundred eighty-one thousand, one hundred thirty-one".