137490981 has 8 divisors (see below), whose sum is σ = 183467424. Its totient is φ = 91587600.

The previous prime is 137490971. The next prime is 137491007. The reversal of 137490981 is 189094731.

It is a happy number.

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

It is not a de Polignac number, because 137490981 - 2¹¹ = 137488933 is a prime.

It is a super-2 number, since 2×137490981² = 37807539712684722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137490931) 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, 13711 + ... + 21516.

It is an arithmetic number, because the mean of its divisors is an integer number (22933428).

Almost surely, 2^137490981 is an apocalyptic number.

It is an amenable number.

137490981 is a deficient number, since it is larger than the sum of its proper divisors (45976443).

137490981 is a wasteful number, since it uses less digits than its factorization.

137490981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36531.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 137490981 is about 11725.6548217999. The cubic root of 137490981 is about 516.1287724701.

The spelling of 137490981 in words is "one hundred thirty-seven million, four hundred ninety thousand, nine hundred eighty-one".