142209691 has 4 divisors (see below), whose sum is σ = 153148912. Its totient is φ = 131270472.

The previous prime is 142209677. The next prime is 142209701. The reversal of 142209691 is 196902241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142209691 - 2⁵ = 142209659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142209631) 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, 5469591 + ... + 5469616.

It is an arithmetic number, because the mean of its divisors is an integer number (38287228).

Almost surely, 2^142209691 is an apocalyptic number.

142209691 is a deficient number, since it is larger than the sum of its proper divisors (10939221).

142209691 is a wasteful number, since it uses less digits than its factorization.

142209691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10939220.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 142209691 is about 11925.1704809617. The cubic root of 142209691 is about 521.9670210567.

The spelling of 142209691 in words is "one hundred forty-two million, two hundred nine thousand, six hundred ninety-one".