137200981 has 4 divisors (see below), whose sum is σ = 137228032. Its totient is φ = 137173932.

The previous prime is 137200939. The next prime is 137200991. The reversal of 137200981 is 189002731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189002731 = 1297 ⋅145723.

It is a 3-Lehmer number, since φ(137200981) divides (137200981-1)³.

It is a cyclic number.

It is not a de Polignac number, because 137200981 - 2⁷ = 137200853 is a prime.

It is a super-2 number, since 2×137200981² = 37648218374724722, which contains 22 as substring.

It is a deceptive number, since it divides R_137200980.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137200991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381 + ... + 16906.

It is an arithmetic number, because the mean of its divisors is an integer number (34307008).

Almost surely, 2^137200981 is an apocalyptic number.

137200981 is the 6763-rd octagonal number.

It is an amenable number.

137200981 is a deficient number, since it is larger than the sum of its proper divisors (27051).

137200981 is an equidigital number, since it uses as much as digits as its factorization.

137200981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27050.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 137200981 is about 11713.2822470903. The cubic root of 137200981 is about 515.7656390703.

The spelling of 137200981 in words is "one hundred thirty-seven million, two hundred thousand, nine hundred eighty-one".