137435491 has 4 divisors (see below), whose sum is σ = 138979800. Its totient is φ = 135891184.

The previous prime is 137435449. The next prime is 137435521. The reversal of 137435491 is 194534731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194534731 = 6211 ⋅31321.

It is a cyclic number.

It is not a de Polignac number, because 137435491 - 2²⁷ = 3217763 is a prime.

It is a super-2 number, since 2×137435491² = 37777028372822162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137435491.

It is not an unprimeable number, because it can be changed into a prime (137435591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772021 + ... + 772198.

It is an arithmetic number, because the mean of its divisors is an integer number (34744950).

Almost surely, 2^137435491 is an apocalyptic number.

137435491 is a deficient number, since it is larger than the sum of its proper divisors (1544309).

137435491 is an equidigital number, since it uses as much as digits as its factorization.

137435491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544308.

The product of its digits is 45360, while the sum is 37.

The square root of 137435491 is about 11723.2884038567. The cubic root of 137435491 is about 516.0593283044.

The spelling of 137435491 in words is "one hundred thirty-seven million, four hundred thirty-five thousand, four hundred ninety-one".