142565621 has 16 divisors (see below), whose sum is σ = 169993728. Its totient is φ = 118041600.

The previous prime is 142565611. The next prime is 142565639. The reversal of 142565621 is 126565241.

It is a cyclic number.

It is not a de Polignac number, because 142565621 - 2¹⁴ = 142549237 is a prime.

It is a super-2 number, since 2×142565621² = 40649912582231282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142565611) 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, 6500 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (10624608).

Almost surely, 2^142565621 is an apocalyptic number.

142565621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142565621 is a deficient number, since it is larger than the sum of its proper divisors (27428107).

142565621 is a wasteful number, since it uses less digits than its factorization.

142565621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24652.

The product of its digits is 14400, while the sum is 32.

The square root of 142565621 is about 11940.0846311909. The cubic root of 142565621 is about 522.4021272233.

The spelling of 142565621 in words is "one hundred forty-two million, five hundred sixty-five thousand, six hundred twenty-one".