137221717 has 16 divisors (see below), whose sum is σ = 147474432. Its totient is φ = 127445760.

The previous prime is 137221709. The next prime is 137221741. The reversal of 137221717 is 717122731.

It is a happy number.

137221717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 137221717 - 2³ = 137221709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137221817) 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, 76333 + ... + 78109.

It is an arithmetic number, because the mean of its divisors is an integer number (9217152).

Almost surely, 2^137221717 is an apocalyptic number.

It is an amenable number.

137221717 is a deficient number, since it is larger than the sum of its proper divisors (10252715).

137221717 is a wasteful number, since it uses less digits than its factorization.

137221717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908.

The product of its digits is 4116, while the sum is 31.

The square root of 137221717 is about 11714.1673626426. The cubic root of 137221717 is about 515.7916213372.

The spelling of 137221717 in words is "one hundred thirty-seven million, two hundred twenty-one thousand, seven hundred seventeen".