291948157 has 4 divisors (see below), whose sum is σ = 309121596. Its totient is φ = 274774720.

The previous prime is 291948149. The next prime is 291948179. The reversal of 291948157 is 751849192.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112763161 + 179184996 = 10619^2 + 13386^2 .

It is a cyclic number.

It is not a de Polignac number, because 291948157 - 2³ = 291948149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291948127) 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, 8586694 + ... + 8586727.

It is an arithmetic number, because the mean of its divisors is an integer number (77280399).

Almost surely, 2^291948157 is an apocalyptic number.

It is an amenable number.

291948157 is a deficient number, since it is larger than the sum of its proper divisors (17173439).

291948157 is a wasteful number, since it uses less digits than its factorization.

291948157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17173438.

The product of its digits is 181440, while the sum is 46.

The square root of 291948157 is about 17086.4904822494. The cubic root of 291948157 is about 663.3894786502.

It can be divided in two parts, 2919 and 48157, that added together give a square (51076 = 226²).

The spelling of 291948157 in words is "two hundred ninety-one million, nine hundred forty-eight thousand, one hundred fifty-seven".