291690136 has 8 divisors (see below), whose sum is σ = 546919020. Its totient is φ = 145845064.

The previous prime is 291690127. The next prime is 291690151. The reversal of 291690136 is 631096192.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 291690095 and 291690104.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18230626 + ... + 18230641.

Almost surely, 2^291690136 is an apocalyptic number.

It is an amenable number.

291690136 is a deficient number, since it is larger than the sum of its proper divisors (255228884).

291690136 is a wasteful number, since it uses less digits than its factorization.

291690136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36461273 (or 36461269 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 291690136 is about 17078.9383745009. The cubic root of 291690136 is about 663.1939886142.

The spelling of 291690136 in words is "two hundred ninety-one million, six hundred ninety thousand, one hundred thirty-six".