42651521 has 16 divisors (see below), whose sum is σ = 50476608. Its totient is φ = 35596800.

The previous prime is 42651517. The next prime is 42651527. The reversal of 42651521 is 12515624.

It is a cyclic number.

It is not a de Polignac number, because 42651521 - 2² = 42651517 is a prime.

It is a super-2 number, since 2×42651521² = 3638304487226882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42651527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4886 + ... + 10448.

It is an arithmetic number, because the mean of its divisors is an integer number (3154788).

Almost surely, 2^42651521 is an apocalyptic number.

42651521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42651521 is a deficient number, since it is larger than the sum of its proper divisors (7825087).

42651521 is a wasteful number, since it uses less digits than its factorization.

42651521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632.

The product of its digits is 2400, while the sum is 26.

The square root of 42651521 is about 6530.8131959198. The cubic root of 42651521 is about 349.3908342558.

The spelling of 42651521 in words is "forty-two million, six hundred fifty-one thousand, five hundred twenty-one".