137602991 has 2 divisors, whose sum is σ = 137602992. Its totient is φ = 137602990.

The previous prime is 137602973. The next prime is 137603027. The reversal of 137602991 is 199206731.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137602991 - 2¹⁰ = 137601967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137602901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68801495 + 68801496.

It is an arithmetic number, because the mean of its divisors is an integer number (68801496).

Almost surely, 2^137602991 is an apocalyptic number.

137602991 is a deficient number, since it is larger than the sum of its proper divisors (1).

137602991 is an equidigital number, since it uses as much as digits as its factorization.

137602991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 137602991 is about 11730.4301285162. The cubic root of 137602991 is about 516.2688929137.

The spelling of 137602991 in words is "one hundred thirty-seven million, six hundred two thousand, nine hundred ninety-one".