291438542 has 4 divisors (see below), whose sum is σ = 437157816. Its totient is φ = 145719270.

The previous prime is 291438443. The next prime is 291438569. The reversal of 291438542 is 245834192.

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

It is a junction number, because it is equal to n+sod(n) for n = 291438496 and 291438505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72859634 + ... + 72859637.

It is an arithmetic number, because the mean of its divisors is an integer number (109289454).

Almost surely, 2^291438542 is an apocalyptic number.

291438542 is a deficient number, since it is larger than the sum of its proper divisors (145719274).

291438542 is a wasteful number, since it uses less digits than its factorization.

291438542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145719273.

The product of its digits is 69120, while the sum is 38.

The square root of 291438542 is about 17071.5711637799. The cubic root of 291438542 is about 663.0032569622.

The spelling of 291438542 in words is "two hundred ninety-one million, four hundred thirty-eight thousand, five hundred forty-two".