133651897 has 4 divisors (see below), whose sum is σ = 133728640. Its totient is φ = 133575156.

The previous prime is 133651883. The next prime is 133651901. The reversal of 133651897 is 798156331.

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: 798156331 = 7 ⋅114022333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133651897 is a prime.

It is a super-3 number, since 3×133651897³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133651877) 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, 35697 + ... + 39262.

It is an arithmetic number, because the mean of its divisors is an integer number (33432160).

Almost surely, 2^133651897 is an apocalyptic number.

It is an amenable number.

133651897 is a deficient number, since it is larger than the sum of its proper divisors (76743).

133651897 is an equidigital number, since it uses as much as digits as its factorization.

133651897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76742.

The product of its digits is 136080, while the sum is 43.

The square root of 133651897 is about 11560.7913656462. The cubic root of 133651897 is about 511.2794952326.

The spelling of 133651897 in words is "one hundred thirty-three million, six hundred fifty-one thousand, eight hundred ninety-seven".