42531397 has 4 divisors (see below), whose sum is σ = 42568416. Its totient is φ = 42494380.

The previous prime is 42531373. The next prime is 42531413. The reversal of 42531397 is 79313524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42531397 - 2²³ = 34142789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42531337) 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, 16729 + ... + 19102.

It is an arithmetic number, because the mean of its divisors is an integer number (10642104).

Almost surely, 2^42531397 is an apocalyptic number.

It is an amenable number.

42531397 is a deficient number, since it is larger than the sum of its proper divisors (37019).

42531397 is a wasteful number, since it uses less digits than its factorization.

42531397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37018.

The product of its digits is 22680, while the sum is 34.

The square root of 42531397 is about 6521.6100006057. The cubic root of 42531397 is about 349.0625170228.

The spelling of 42531397 in words is "forty-two million, five hundred thirty-one thousand, three hundred ninety-seven".