137209090 has 8 divisors (see below), whose sum is σ = 246976380. Its totient is φ = 54883632.

The previous prime is 137209031. The next prime is 137209117. The reversal of 137209090 is 90902731.

It can be written as a sum of positive squares in 2 ways, for example, as 133610481 + 3598609 = 11559^2 + 1897^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6860445 + ... + 6860464.

Almost surely, 2^137209090 is an apocalyptic number.

137209090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

137209090 is a deficient number, since it is larger than the sum of its proper divisors (109767290).

137209090 is a wasteful number, since it uses less digits than its factorization.

137209090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13720916.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 137209090 is about 11713.6283874810. The cubic root of 137209090 is about 515.7757999820.

The spelling of 137209090 in words is "one hundred thirty-seven million, two hundred nine thousand, ninety".