42157451 has 4 divisors (see below), whose sum is σ = 48179952. Its totient is φ = 36134952.

The previous prime is 42157441. The next prime is 42157487. The reversal of 42157451 is 15475124.

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

It is not a de Polignac number, because 42157451 - 2¹⁴ = 42141067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42157421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3011240 + ... + 3011253.

It is an arithmetic number, because the mean of its divisors is an integer number (12044988).

Almost surely, 2^42157451 is an apocalyptic number.

42157451 is a deficient number, since it is larger than the sum of its proper divisors (6022501).

42157451 is an equidigital number, since it uses as much as digits as its factorization.

42157451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022500.

The product of its digits is 5600, while the sum is 29.

The square root of 42157451 is about 6492.8769432356. The cubic root of 42157451 is about 348.0364909768.

The spelling of 42157451 in words is "forty-two million, one hundred fifty-seven thousand, four hundred fifty-one".