137802121 has 2 divisors, whose sum is σ = 137802122. Its totient is φ = 137802120.

The previous prime is 137802103. The next prime is 137802163. The reversal of 137802121 is 121208731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106832896 + 30969225 = 10336^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 137802121 - 2⁵ = 137802089 is a prime.

It is not a weakly prime, because it can be changed into another prime (137806121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68901060 + 68901061.

It is an arithmetic number, because the mean of its divisors is an integer number (68901061).

Almost surely, 2^137802121 is an apocalyptic number.

It is an amenable number.

137802121 is a deficient number, since it is larger than the sum of its proper divisors (1).

137802121 is an equidigital number, since it uses as much as digits as its factorization.

137802121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 137802121 is about 11738.9148135592. The cubic root of 137802121 is about 516.5178096779.

The spelling of 137802121 in words is "one hundred thirty-seven million, eight hundred two thousand, one hundred twenty-one".