136858491 has 40 divisors (see below), whose sum is σ = 254901504. Its totient is φ = 71092080.

The previous prime is 136858489. The next prime is 136858531. The reversal of 136858491 is 194858631.

136858491 = 1295² + 1296² + ... + 1371².

136858491 is a `hidden beast` number, since 1 + 3 + 68 + 584 + 9 + 1 = 666.

It is not a de Polignac number, because 136858491 - 2¹ = 136858489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136858591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4735 + ... + 17208.

Almost surely, 2^136858491 is an apocalyptic number.

136858491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136858491 is a deficient number, since it is larger than the sum of its proper divisors (118043013).

136858491 is a wasteful number, since it uses less digits than its factorization.

136858491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21973 (or 21964 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 136858491 is about 11698.6533840438. The cubic root of 136858491 is about 515.3361189106.

The spelling of 136858491 in words is "one hundred thirty-six million, eight hundred fifty-eight thousand, four hundred ninety-one".