142661001 has 24 divisors (see below), whose sum is σ = 225457344. Its totient is φ = 79978080.

The previous prime is 142660967. The next prime is 142661003. The reversal of 142661001 is 100166241.

It is not a de Polignac number, because 142661001 - 2⁹ = 142660489 is a prime.

It is a super-2 number, since 2×142661001² = 40704322412644002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (142661003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1365 + ... + 16946.

It is an arithmetic number, because the mean of its divisors is an integer number (9394056).

Almost surely, 2^142661001 is an apocalyptic number.

It is an amenable number.

142661001 is a deficient number, since it is larger than the sum of its proper divisors (82796343).

142661001 is a wasteful number, since it uses less digits than its factorization.

142661001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18381 (or 18374 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 142661001 is about 11944.0780724173. The cubic root of 142661001 is about 522.5186013234.

The spelling of 142661001 in words is "one hundred forty-two million, six hundred sixty-one thousand, one".