42151661 has 4 divisors (see below), whose sum is σ = 43511424. Its totient is φ = 40791900.

The previous prime is 42151657. The next prime is 42151667. The reversal of 42151661 is 16615124.

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 42151661 - 2² = 42151657 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 42151661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42151667) 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, 679835 + ... + 679896.

It is an arithmetic number, because the mean of its divisors is an integer number (10877856).

Almost surely, 2^42151661 is an apocalyptic number.

It is an amenable number.

42151661 is a deficient number, since it is larger than the sum of its proper divisors (1359763).

42151661 is a wasteful number, since it uses less digits than its factorization.

42151661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359762.

The product of its digits is 1440, while the sum is 26.

The square root of 42151661 is about 6492.4310546975. The cubic root of 42151661 is about 348.0205568735.

Adding to 42151661 its reverse (16615124), we get a palindrome (58766785).

The spelling of 42151661 in words is "forty-two million, one hundred fifty-one thousand, six hundred sixty-one".