42645951 has 6 divisors (see below), whose sum is σ = 61599720. Its totient is φ = 28430628.

The previous prime is 42645947. The next prime is 42645959. The reversal of 42645951 is 15954624.

42645951 is a `hidden beast` number, since 4 + 2 + 64 + 595 + 1 = 666.

It is not a de Polignac number, because 42645951 - 2² = 42645947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42645959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2369211 + ... + 2369228.

It is an arithmetic number, because the mean of its divisors is an integer number (10266620).

Almost surely, 2^42645951 is an apocalyptic number.

42645951 is a deficient number, since it is larger than the sum of its proper divisors (18953769).

42645951 is a wasteful number, since it uses less digits than its factorization.

42645951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738445 (or 4738442 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 42645951 is about 6530.3867419932. The cubic root of 42645951 is about 349.3756242342.

The spelling of 42645951 in words is "forty-two million, six hundred forty-five thousand, nine hundred fifty-one".