137147721 has 8 divisors (see below), whose sum is σ = 193620384. Its totient is φ = 86053440.

The previous prime is 137147701. The next prime is 137147749. The reversal of 137147721 is 127741731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137147721 - 2⁹ = 137147209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (137147701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344535 + ... + 1344636.

It is an arithmetic number, because the mean of its divisors is an integer number (24202548).

Almost surely, 2^137147721 is an apocalyptic number.

It is an amenable number.

137147721 is a deficient number, since it is larger than the sum of its proper divisors (56472663).

137147721 is a wasteful number, since it uses less digits than its factorization.

137147721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689191.

The product of its digits is 8232, while the sum is 33.

The square root of 137147721 is about 11711.0085389773. The cubic root of 137147721 is about 515.6988921394.

The spelling of 137147721 in words is "one hundred thirty-seven million, one hundred forty-seven thousand, seven hundred twenty-one".