133751861 has 2 divisors, whose sum is σ = 133751862. Its totient is φ = 133751860.

The previous prime is 133751797. The next prime is 133751873. The reversal of 133751861 is 168157331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82700836 + 51051025 = 9094^2 + 7145^2 .

It is a cyclic number.

It is not a de Polignac number, because 133751861 - 2⁶ = 133751797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133757861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66875930 + 66875931.

It is an arithmetic number, because the mean of its divisors is an integer number (66875931).

Almost surely, 2^133751861 is an apocalyptic number.

It is an amenable number.

133751861 is a deficient number, since it is larger than the sum of its proper divisors (1).

133751861 is an equidigital number, since it uses as much as digits as its factorization.

133751861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 133751861 is about 11565.1139639867. The cubic root of 133751861 is about 511.4069327714.

The spelling of 133751861 in words is "one hundred thirty-three million, seven hundred fifty-one thousand, eight hundred sixty-one".