162137491 has 4 divisors (see below), whose sum is σ = 162221400. Its totient is φ = 162053584.

The previous prime is 162137473. The next prime is 162137509. The reversal of 162137491 is 194731261.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (162137473) and next prime (162137509).

It is a cyclic number.

It is not a de Polignac number, because 162137491 - 2⁹ = 162136979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162137191) 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, 38986 + ... + 42943.

It is an arithmetic number, because the mean of its divisors is an integer number (40555350).

Almost surely, 2^162137491 is an apocalyptic number.

162137491 is a deficient number, since it is larger than the sum of its proper divisors (83909).

162137491 is an equidigital number, since it uses as much as digits as its factorization.

162137491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83908.

The product of its digits is 9072, while the sum is 34.

The square root of 162137491 is about 12733.3220724208. The cubic root of 162137491 is about 545.2903550600.

The spelling of 162137491 in words is "one hundred sixty-two million, one hundred thirty-seven thousand, four hundred ninety-one".