137997197 has 8 divisors (see below), whose sum is σ = 148793400. Its totient is φ = 127226880.

The previous prime is 137997193. The next prime is 137997199. The reversal of 137997197 is 791799731.

137997197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1901641 + 136095556 = 1379^2 + 11666^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137997197 - 2² = 137997193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137997193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5429 + ... + 17477.

It is an arithmetic number, because the mean of its divisors is an integer number (18599175).

Almost surely, 2^137997197 is an apocalyptic number.

It is an amenable number.

137997197 is a deficient number, since it is larger than the sum of its proper divisors (10796203).

137997197 is a wasteful number, since it uses less digits than its factorization.

137997197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12943.

The product of its digits is 750141, while the sum is 53.

The square root of 137997197 is about 11747.2208202621. The cubic root of 137997197 is about 516.7614264395.

The spelling of 137997197 in words is "one hundred thirty-seven million, nine hundred ninety-seven thousand, one hundred ninety-seven".