137445389 has 2 divisors, whose sum is σ = 137445390. Its totient is φ = 137445388.

The previous prime is 137445379. The next prime is 137445431. The reversal of 137445389 is 983544731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 15342889 = 11050^2 + 3917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137445389 is a prime.

It is a super-2 number, since 2×137445389² = 37782469914722642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137445359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68722694 + 68722695.

It is an arithmetic number, because the mean of its divisors is an integer number (68722695).

Almost surely, 2^137445389 is an apocalyptic number.

It is an amenable number.

137445389 is a deficient number, since it is larger than the sum of its proper divisors (1).

137445389 is an equidigital number, since it uses as much as digits as its factorization.

137445389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 137445389 is about 11723.7105474334. The cubic root of 137445389 is about 516.0717167411.

The spelling of 137445389 in words is "one hundred thirty-seven million, four hundred forty-five thousand, three hundred eighty-nine".