133551257 has 4 divisors (see below), whose sum is σ = 152630016. Its totient is φ = 114472500.

The previous prime is 133551251. The next prime is 133551281. The reversal of 133551257 is 752155331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 752155331 = 2801 ⋅268531.

It is a cyclic number.

It is not a de Polignac number, because 133551257 - 2¹⁰ = 133550233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133551251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9539369 + ... + 9539382.

It is an arithmetic number, because the mean of its divisors is an integer number (38157504).

Almost surely, 2^133551257 is an apocalyptic number.

It is an amenable number.

133551257 is a deficient number, since it is larger than the sum of its proper divisors (19078759).

133551257 is an equidigital number, since it uses as much as digits as its factorization.

133551257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19078758.

The product of its digits is 15750, while the sum is 32.

The square root of 133551257 is about 11556.4379027449. The cubic root of 133551257 is about 511.1511316996.

The spelling of 133551257 in words is "one hundred thirty-three million, five hundred fifty-one thousand, two hundred fifty-seven".