137021641 has 4 divisors (see below), whose sum is σ = 138561300. Its totient is φ = 135481984.

The previous prime is 137021639. The next prime is 137021669. The reversal of 137021641 is 146120731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146120731 = 1109 ⋅131759.

It can be written as a sum of positive squares in 2 ways, for example, as 28132416 + 108889225 = 5304^2 + 10435^2 .

It is a cyclic number.

It is not a de Polignac number, because 137021641 - 2¹ = 137021639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137021671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769696 + ... + 769873.

It is an arithmetic number, because the mean of its divisors is an integer number (34640325).

Almost surely, 2^137021641 is an apocalyptic number.

It is an amenable number.

137021641 is a deficient number, since it is larger than the sum of its proper divisors (1539659).

137021641 is an equidigital number, since it uses as much as digits as its factorization.

137021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539658.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 137021641 is about 11705.6243319184. The cubic root of 137021641 is about 515.5408162338.

The spelling of 137021641 in words is "one hundred thirty-seven million, twenty-one thousand, six hundred forty-one".