42137261 has 4 divisors (see below), whose sum is σ = 43590300. Its totient is φ = 40684224.

The previous prime is 42137201. The next prime is 42137267. The reversal of 42137261 is 16273124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22944100 + 19193161 = 4790^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 42137261 - 2¹⁴ = 42120877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42137261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42137267) 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, 726476 + ... + 726533.

It is an arithmetic number, because the mean of its divisors is an integer number (10897575).

Almost surely, 2^42137261 is an apocalyptic number.

It is an amenable number.

42137261 is a deficient number, since it is larger than the sum of its proper divisors (1453039).

42137261 is a wasteful number, since it uses less digits than its factorization.

42137261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453038.

The product of its digits is 2016, while the sum is 26.

The square root of 42137261 is about 6491.3219763004. The cubic root of 42137261 is about 347.9809216872.

The spelling of 42137261 in words is "forty-two million, one hundred thirty-seven thousand, two hundred sixty-one".