133649691 has 32 divisors (see below), whose sum is σ = 208396800. Its totient is φ = 74611200.

The previous prime is 133649651. The next prime is 133649693. The reversal of 133649691 is 196946331.

It is not a de Polignac number, because 133649691 - 2⁹ = 133649179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133649693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333091 + ... + 333491.

It is an arithmetic number, because the mean of its divisors is an integer number (6512400).

Almost surely, 2^133649691 is an apocalyptic number.

133649691 is a deficient number, since it is larger than the sum of its proper divisors (74747109).

133649691 is a wasteful number, since it uses less digits than its factorization.

133649691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739.

The product of its digits is 104976, while the sum is 42.

The square root of 133649691 is about 11560.6959565590. The cubic root of 133649691 is about 511.2766822316.

The spelling of 133649691 in words is "one hundred thirty-three million, six hundred forty-nine thousand, six hundred ninety-one".