291157442 has 16 divisors (see below), whose sum is σ = 440696760. Its totient is φ = 144263808.

The previous prime is 291157417. The next prime is 291157481. The reversal of 291157442 is 244751192.

It can be written as a sum of positive squares in 4 ways, for example, as 290327521 + 829921 = 17039^2 + 911^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142484 + ... + 144512.

Almost surely, 2^291157442 is an apocalyptic number.

291157442 is a deficient number, since it is larger than the sum of its proper divisors (149539318).

291157442 is a wasteful number, since it uses less digits than its factorization.

291157442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its digits is 20160, while the sum is 35.

The square root of 291157442 is about 17063.3361919643. The cubic root of 291157442 is about 662.7900271380.

The spelling of 291157442 in words is "two hundred ninety-one million, one hundred fifty-seven thousand, four hundred forty-two".