137601661 has 2 divisors, whose sum is σ = 137601662. Its totient is φ = 137601660.

The previous prime is 137601641. The next prime is 137601683. The reversal of 137601661 is 166106731.

137601661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120012025 + 17589636 = 10955^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 137601661 - 2¹⁹ = 137077373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137601641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68800830 + 68800831.

It is an arithmetic number, because the mean of its divisors is an integer number (68800831).

Almost surely, 2^137601661 is an apocalyptic number.

It is an amenable number.

137601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

137601661 is an equidigital number, since it uses as much as digits as its factorization.

137601661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 137601661 is about 11730.3734382159. The cubic root of 137601661 is about 516.2672295782.

The spelling of 137601661 in words is "one hundred thirty-seven million, six hundred one thousand, six hundred sixty-one".