133778951 has 2 divisors, whose sum is σ = 133778952. Its totient is φ = 133778950.

The previous prime is 133778929. The next prime is 133778959. The reversal of 133778951 is 159877331.

It is a strong prime.

It is an emirp because it is prime and its reverse (159877331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133778951 - 2¹⁸ = 133516807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133778959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66889475 + 66889476.

It is an arithmetic number, because the mean of its divisors is an integer number (66889476).

Almost surely, 2^133778951 is an apocalyptic number.

133778951 is a deficient number, since it is larger than the sum of its proper divisors (1).

133778951 is an equidigital number, since it uses as much as digits as its factorization.

133778951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 133778951 is about 11566.2850993740. The cubic root of 133778951 is about 511.4414570974.

The spelling of 133778951 in words is "one hundred thirty-three million, seven hundred seventy-eight thousand, nine hundred fifty-one".