137202991 has 2 divisors, whose sum is σ = 137202992. Its totient is φ = 137202990.

The previous prime is 137202983. The next prime is 137203007. The reversal of 137202991 is 199202731.

It is a happy number.

137202991 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 is a cyclic number.

It is not a de Polignac number, because 137202991 - 2³ = 137202983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137202941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68601495 + 68601496.

It is an arithmetic number, because the mean of its divisors is an integer number (68601496).

Almost surely, 2^137202991 is an apocalyptic number.

137202991 is a deficient number, since it is larger than the sum of its proper divisors (1).

137202991 is an equidigital number, since it uses as much as digits as its factorization.

137202991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 137202991 is about 11713.3680468087. The cubic root of 137202991 is about 515.7681577206.

The spelling of 137202991 in words is "one hundred thirty-seven million, two hundred two thousand, nine hundred ninety-one".