42391451 has 4 divisors (see below), whose sum is σ = 44622600. Its totient is φ = 40160304.

The previous prime is 42391429. The next prime is 42391463. The reversal of 42391451 is 15419324.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42391451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42391411) 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, 1115546 + ... + 1115583.

It is an arithmetic number, because the mean of its divisors is an integer number (11155650).

Almost surely, 2^42391451 is an apocalyptic number.

42391451 is a deficient number, since it is larger than the sum of its proper divisors (2231149).

42391451 is a wasteful number, since it uses less digits than its factorization.

42391451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231148.

The product of its digits is 4320, while the sum is 29.

The square root of 42391451 is about 6510.8717542277. The cubic root of 42391451 is about 348.6792426776.

The spelling of 42391451 in words is "forty-two million, three hundred ninety-one thousand, four hundred fifty-one".