42691251 has 8 divisors (see below), whose sum is σ = 56952720. Its totient is φ = 28445312.

The previous prime is 42691249. The next prime is 42691361. The reversal of 42691251 is 15219624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42691251 - 2¹ = 42691249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42691211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6511 + ... + 11303.

It is an arithmetic number, because the mean of its divisors is an integer number (7119090).

Almost surely, 2^42691251 is an apocalyptic number.

42691251 is a deficient number, since it is larger than the sum of its proper divisors (14261469).

42691251 is a wasteful number, since it uses less digits than its factorization.

42691251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7765.

The product of its digits is 4320, while the sum is 30.

The square root of 42691251 is about 6533.8542224326. The cubic root of 42691251 is about 349.4992867376.

The spelling of 42691251 in words is "forty-two million, six hundred ninety-one thousand, two hundred fifty-one".