291311493 has 12 divisors (see below), whose sum is σ = 426936384. Its totient is φ = 176552200.

The previous prime is 291311483. The next prime is 291311513. The reversal of 291311493 is 394113192.

It is a happy number.

It is not a de Polignac number, because 291311493 - 2¹³ = 291303301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291311483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400893 + ... + 401618.

It is an arithmetic number, because the mean of its divisors is an integer number (35578032).

Almost surely, 2^291311493 is an apocalyptic number.

It is an amenable number.

291311493 is a deficient number, since it is larger than the sum of its proper divisors (135624891).

291311493 is a wasteful number, since it uses less digits than its factorization.

291311493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802536 (or 802525 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 291311493 is about 17067.8496888155. The cubic root of 291311493 is about 662.9069002902.

The spelling of 291311493 in words is "two hundred ninety-one million, three hundred eleven thousand, four hundred ninety-three".