242172491 has 4 divisors (see below), whose sum is σ = 264188184. Its totient is φ = 220156800.

The previous prime is 242172487. The next prime is 242172559. The reversal of 242172491 is 194271242.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 242172491 - 2² = 242172487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242172401) 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, 11007830 + ... + 11007851.

It is an arithmetic number, because the mean of its divisors is an integer number (66047046).

Almost surely, 2^242172491 is an apocalyptic number.

242172491 is a deficient number, since it is larger than the sum of its proper divisors (22015693).

242172491 is a wasteful number, since it uses less digits than its factorization.

242172491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22015692.

The product of its digits is 8064, while the sum is 32.

The square root of 242172491 is about 15561.8922692583. The cubic root of 242172491 is about 623.3159923176.

The spelling of 242172491 in words is "two hundred forty-two million, one hundred seventy-two thousand, four hundred ninety-one".