137772391 has 4 divisors (see below), whose sum is σ = 137835432. Its totient is φ = 137709352.

The previous prime is 137772379. The next prime is 137772407. The reversal of 137772391 is 193277731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137772391 - 2⁷ = 137772263 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137772331) 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, 28120 + ... + 32653.

It is an arithmetic number, because the mean of its divisors is an integer number (34458858).

Almost surely, 2^137772391 is an apocalyptic number.

137772391 is a deficient number, since it is larger than the sum of its proper divisors (63041).

137772391 is an equidigital number, since it uses as much as digits as its factorization.

137772391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63040.

The product of its digits is 55566, while the sum is 40.

The square root of 137772391 is about 11737.6484442157. The cubic root of 137772391 is about 516.4806617762.

The spelling of 137772391 in words is "one hundred thirty-seven million, seven hundred seventy-two thousand, three hundred ninety-one".