133998537 has 16 divisors (see below), whose sum is σ = 183480192. Its totient is φ = 86935680.

The previous prime is 133998509. The next prime is 133998541. The reversal of 133998537 is 735899331.

It is a de Polignac number, because none of the positive numbers 2^k-133998537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133998547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58783 + ... + 61019.

It is an arithmetic number, because the mean of its divisors is an integer number (11467512).

Almost surely, 2^133998537 is an apocalyptic number.

It is an amenable number.

133998537 is a deficient number, since it is larger than the sum of its proper divisors (49481655).

133998537 is a wasteful number, since it uses less digits than its factorization.

133998537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768.

The product of its digits is 612360, while the sum is 48.

The square root of 133998537 is about 11575.7737106424. The cubic root of 133998537 is about 511.7211323692.

The spelling of 133998537 in words is "one hundred thirty-three million, nine hundred ninety-eight thousand, five hundred thirty-seven".