137551681 has 8 divisors (see below), whose sum is σ = 145827584. Its totient is φ = 129515760.

The previous prime is 137551649. The next prime is 137551763. The reversal of 137551681 is 186155731.

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 137551681 - 2⁵ = 137551649 is a prime.

It is a super-2 number, since 2×137551681² = 37840929891851522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137551681.

It is not an unprimeable number, because it can be changed into a prime (137551081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58815 + ... + 61108.

It is an arithmetic number, because the mean of its divisors is an integer number (18228448).

Almost surely, 2^137551681 is an apocalyptic number.

It is an amenable number.

137551681 is a deficient number, since it is larger than the sum of its proper divisors (8275903).

137551681 is a wasteful number, since it uses less digits than its factorization.

137551681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119991.

The product of its digits is 25200, while the sum is 37.

The square root of 137551681 is about 11728.2428777716. The cubic root of 137551681 is about 516.2047154083.

The spelling of 137551681 in words is "one hundred thirty-seven million, five hundred fifty-one thousand, six hundred eighty-one".